Debt (Details) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Short-term Debt [Line Items] | ||
Outstanding Balance | $ 3,278,000 | $ 5,581,000 |
Face amount of eligible notes issued | $ 2,000,000 | $ 2,000,000 |
Short-term Debt [Member] | ||
Short-term Debt [Line Items] | ||
Year-End Stated Rate on Debt | 2.05% | 1.20% |
Fees to maintain the secured financing facility | $ 9,200 | $ 8,600 |
Commercial Paper [Member] | ||
Short-term Debt [Line Items] | ||
Outstanding Balance | $ 1,168,000 | $ 2,993,000 |
Commercial Paper [Member] | Short-term Debt [Member] | ||
Short-term Debt [Line Items] | ||
Year-End Stated Rate on Debt | 1.54% | 1.13% |
Other Short Term Borrowings [Member] | ||
Short-term Debt [Line Items] | ||
Outstanding Balance | $ 2,110,000 | $ 2,588,000 |
Other Short Term Borrowings [Member] | Bank Overdrafts [Member] | ||
Short-term Debt [Line Items] | ||
Outstanding Balance | $ 132,000 | $ 369,000 |
Other Short Term Borrowings [Member] | Short-term Debt [Member] | ||
Short-term Debt [Line Items] | ||
Year-End Stated Rate on Debt | 2.34% | 1.28% |