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Notes Payable - Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Due within one year | $ 8,089,826 | $ 8,440,123
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.24% | 0.70%
Long-term Debt, Current Maturities | $ 3,804,646 | $ 2,155,784
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 2,644,734 | $ 1,733,121
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.91% | 1.68%
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 1,842,143 | $ 1,283,869
Long-term Debt, Maturities, Repayments of Principal in Year Four | 849,263 | 495,096
Long-term Debt, Maturities, Repayments of Principal in Year Five | 790,564 | 602,037
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,306,086 | 1,108,854
Long-term Debt, Excluding Current Maturities | 7,432,790 | 5,222,977
Debt and Capital Lease Obligations | $ 15,522,616 | $ 13,663,100
Debt, Weighted Average Interest Rate | 1.56% | 1.07%
Debt Instrument, Redemption, Period Two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.48% | 1.08%
Debt Instrument, Redemption, Period Three [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.68% | 1.32%
Debt Instrument, Redemption, Period Four [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.85% | 1.50%
Debt Instrument, Redemption, Period Five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.03% | 1.83%
Debt Instrument, Redemption, After Period Five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.05% | 3.01%
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 1,724,969 | $ 3,789,137
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.20% | 0.59%
Short-term Debt, Average Outstanding Amount | $ 2,262,582 | $ 5,753,425
Debt Instrument, Interest Rate During Period | 0.86% | 0.50%
Medium-term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 2,560,211 | $ 2,495,202
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.27% | 0.70%
Short-term Debt, Average Outstanding Amount | $ 2,885,966 | $ 1,551,094
Debt Instrument, Interest Rate During Period | 1.04% | 0.57%
Long-term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.23% | 0.90%

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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