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Notes Payable - Earliest Interest Reset Date of Borrowing Outstanding (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
Long-term Debt, Maturities, Repayments of Principal in Year Two | 2,644,734 | 1,733,121
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
Debt and Capital Lease Obligations | $ 15,522,616 | $ 13,663,100
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.24% | 0.70%
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.91% | 1.68%
Debt, Weighted Average Interest Rate | 1.56% | 1.07%
Meduim Term Notes Called During the Period | $ 0 | $ 1,300,000
Due within one year [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 9,291,949 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.28% |
Due year two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 2,176,327 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.49% |
Due year three [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 1,526,236 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.71% |
Due year four [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | $ 744,336 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.89% |
Due year five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 719,609 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.08% |
Due after five years [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 1,064,159 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.31% |

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