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Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Outstanding Balance $ 4,812,000 $ 3,480,000
Face amount of eligible notes issued $ 2,000,000  
Short-term Debt [Member]    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 0.79% 0.69%
Fees to maintain the secured financing facility $ 6,700 $ 7,000
Commercial Paper [Member]    
Short-term Debt [Line Items]    
Outstanding Balance $ 2,120,000 $ 769,000
Commercial Paper [Member] | Short-term Debt [Member]    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 0.38% 0.29%
Other Short Term Borrowings [Member]    
Short-term Debt [Line Items]    
Outstanding Balance $ 2,692,000 $ 2,711,000
Other Short Term Borrowings [Member] | Bank Overdrafts [Member]    
Short-term Debt [Line Items]    
Outstanding Balance $ 410,000 $ 470,000
Other Short Term Borrowings [Member] | Short-term Debt [Member]    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 1.11% 0.81%