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

Debt (Revolving credit facilities) (Details)

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Debt (Revolving credit facilities) (Details) - Unsecured - USD ($)
1 Months Ended
Oct. 31, 2019
Mar. 31, 2018
Asia Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility maximum borrowing capacity   $ 950,000,000.0
Citi Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility maximum borrowing capacity $ 4,000,000,000.0  
Credit facility increase borrowing capacity $ 500,000,000