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Unsecured Debt (Details)
$ in Millions
1 Months Ended
Feb. 29, 2016
USD ($)
Debt Instrument [Line Items]  
Weighted average interest rate (as a percent) 0.80%
Commercial Paper  
Debt Instrument [Line Items]  
Short-term borrowings $ 240
Publicly Traded Notes Euro-denominated Notes  
Debt Instrument [Line Items]  
Proceeds from issuance of notes $ 555
Notes, interest rate (percentage) 1.625%
Bank Loans | Euro-denominated  
Debt Instrument [Line Items]  
Short-term borrowings $ 25