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Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 5,581,000 | $ 4,812,000
Face amount of eligible notes issued | $ 2,000,000 |
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 1.20% | 0.79%
Fees to maintain the secured financing facility | $ 8,600 | $ 6,700
Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 2,993,000 | $ 2,120,000
Commercial Paper [Member] | Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 1.13% | 0.38%
Other Short Term Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 2,588,000 | $ 2,692,000
Other Short Term Borrowings [Member] | Bank Overdrafts [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding Balance | $ 369,000 | $ 410,000
Other Short Term Borrowings [Member] | Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
Year-End Stated Rate on Debt | 1.28% | 1.11%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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