Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Debt (Unsecured Credit Facilities Narrative) (Details)

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Debt (Unsecured Credit Facilities Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 16, 2013
Feb. 28, 2017
Mar. 31, 2014
Dec. 31, 2016
Oct. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Oct. 31, 2014
Sep. 30, 2014
Line of Credit Facility [Line Items]                      
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity       $ 34,699,715,000              
Undrawn amount, available for drawdown under the facility       $ 7,338,181,000              
Asia Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, current borrowing capacity         $ 600,000,000 $ 585,000,000 $ 575,000,000        
Credit facility, term       5 years              
Asia Revolving Credit Facility [Member] | Revolving Period [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, term       3 years              
Spread over reference rate       1.95%              
Asia Revolving Credit Facility [Member] | Term Loan [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, term       2 years              
Asia Revolving Credit Facility [Member] | Minimum [Member]                      
Line of Credit Facility [Line Items]                      
Percentage of balance to be repaid on specific dates       33.00%              
Asia Revolving Credit Facility [Member] | Maximum [Member]                      
Line of Credit Facility [Line Items]                      
Percentage of balance to be repaid on specific dates       67.00%              
Asia Revolving Credit Facility [Member] | Interest Rate During First Year [Member] | Term Loan [Member]                      
Line of Credit Facility [Line Items]                      
Spread over reference rate       2.25%              
Asia Revolving Credit Facility [Member] | Interest Rate During Second Year [Member] | Term Loan [Member]                      
Line of Credit Facility [Line Items]                      
Spread over reference rate       2.50%              
Citi Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, current borrowing capacity     $ 2,750,000,000           $ 3,000,000,000 $ 2,955,000,000 $ 2,925,000,000
Credit facility, term     4 years                
Spread over reference rate       2.00%              
Unused loan commitment fee, percentage       0.375%              
Citi Revolving Credit Facility [Member] | Maximum [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility maximum borrowing capacity     $ 4,000,000,000                
AIG Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, current borrowing capacity               $ 500,000,000      
Credit facility maximum borrowing capacity $ 1,000,000,000                    
Credit facility, term 5 years                    
Maturity date of facility       May 01, 2019              
AIG Revolving Credit Facility [Member] | Interest Rate Option 1 [Member]                      
Line of Credit Facility [Line Items]                      
Spread over reference rate       3.75%              
AIG Revolving Credit Facility [Member] | Interest Rate Option 2 [Member]                      
Line of Credit Facility [Line Items]                      
Stated interest rate       2.75%              
AIG Revolving Credit Facility [Member] | Interest Rate Option 2(x) [Member]                      
Line of Credit Facility [Line Items]                      
Spread over reference rate       0.50%              
AIG Revolving Credit Facility [Member] | Interest Rate Option 2(z) [Member]                      
Line of Credit Facility [Line Items]                      
Spread over reference rate       1.00%              
Unsecured Debt [Member]                      
Line of Credit Facility [Line Items]                      
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity       $ 18,469,864,000              
Undrawn amount, available for drawdown under the facility       4,100,000,000              
Asia Revolving Credit Facility [Member] | Unsecured Debt [Member]                      
Line of Credit Facility [Line Items]                      
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity       600,000,000              
Undrawn amount, available for drawdown under the facility       600,000,000              
Citi Revolving Credit Facility [Member] | Unsecured Debt [Member]                      
Line of Credit Facility [Line Items]                      
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity       3,000,000,000              
Undrawn amount, available for drawdown under the facility       $ 3,000,000,000              
Subsequent Event [Member] | Citi Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility, current borrowing capacity   $ 3,745,000,000                  
Maturity date of facility   Feb. 01, 2021                  
Spread over reference rate   1.50%                  
Unused loan commitment fee, percentage   0.25%