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
Mar. 31, 2014
Dec. 31, 2015
Oct. 31, 2014
Sep. 30, 2014
Oct. 31, 2013
Line of Credit Facility [Line Items]            
Long Term Debt Composed Of Either Debt Instrument Face Amount Or Line Of Credit Facility Current Borrowing Capacity     $ 35,649,883,000      
Undrawn amount, available for drawdown under the facility     $ 6,689,395,000      
Asia Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Credit facility, current borrowing capacity       $ 300,000,000   $ 180,000,000
Credit facility maximum borrowing capacity           $ 250,000,000
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   $ 2,955,000,000 $ 2,925,000,000  
Credit facility, term   4 years        
Spread over reference rate     2.25%      
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 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     $ 19,022,823,000      
Undrawn amount, available for drawdown under the facility     4,075,000,000      
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     575,000,000      
Undrawn amount, available for drawdown under the facility     575,000,000      
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