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Notes Payable - Earliest Interest Reset Date of Borrowing Outstanding (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Due within one year | $ 8,440,123 | $ 9,111,461
Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,733,121 | 1,200,558
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,283,869 | 1,539,264
Long-term Debt, Maturities, Repayments of Principal in Year Four | 495,096 | 520,284
Long-term Debt, Maturities, Repayments of Principal in Year Five | 602,037 | 529,567
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,108,854 | 1,177,363
Total notes payable | $ 13,663,100 | $ 14,078,497
Short-term Debt, Weighted Average Interest Rate | 0.70% | 0.48%
Long-term Debt, Weighted Average Interest Rate | 1.68% | 1.59%
Debt, Weighted Average Interest Rate | 1.07% | 0.87%
Meduim Term Notes Called During the Period | $ 1,300,000 | $ 2,400,000
Due within one year [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 9,416,805 |
Short-term Debt, Weighted Average Interest Rate | 0.73% |
Due year two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 1,488,131 |
Long-term Debt, Weighted Average Interest Rate | 1.12% |
Due year three [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 919,021 |
Long-term Debt, Weighted Average Interest Rate | 1.47% |
Due year four [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | $ 329,181 |
Long-term Debt, Weighted Average Interest Rate | 1.77% |
Due year five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 547,078 |
Long-term Debt, Weighted Average Interest Rate | 1.91% |
Due after five years [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 962,884 |
Long-term Debt, Weighted Average Interest Rate | 3.27% |

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