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Notes Payable - Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Long-term Debt, Current Maturities | $ 4,344,285 | $ 3,804,646
Due within one year | 7,757,050 | 8,089,826
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 3,090,405 | $ 2,644,734
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.48% | 1.91%
Long-term Debt, Excluding Current Maturities | $ 8,486,647 | $ 7,432,790
Due after one year | 8,486,647 | 7,432,790
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,434,383 | 1,306,086
Long-term Debt, Maturities, Repayments of Principal in Year Five | 881,738 | 790,564
Long-term Debt, Maturities, Repayments of Principal in Year Four | 859,470 | 849,263
Long-term Debt, Maturities, Repayments of Principal in Year Three | 2,220,651 | 1,842,143
Debt and Capital Lease Obligations | $ 16,243,697 | $ 15,522,616
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 2.10% | 1.24%
Debt, Weighted Average Interest Rate | 2.30% | 1.56%
Debt Instrument, Redemption, Period Two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.11% | 1.48%
Debt Instrument, Redemption, Period Three [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.41% | 1.68%
Debt Instrument, Redemption, Period Four [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.19% | 1.85%
Debt Instrument, Redemption, Period Five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.88% | 2.03%
Debt Instrument, Redemption, After Period Five [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.34% | 3.05%
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 1,586,385 | $ 1,724,969
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 2.35% | 1.20%
Short-term Debt, Average Outstanding Amount | $ 1,432,470 | $ 2,262,582
Debt Instrument, Interest Rate During Period | 1.83% | 0.86%
Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 239,327 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.66% |
Due after one year | $ 1,363,244 |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 294,720 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 253,758 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 165,810 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 409,629 |
Medium-term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Due within one year | $ 1,826,380 | $ 2,560,211
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 2.29% | 1.27%
Short-term Debt, Average Outstanding Amount | $ 1,977,445 | $ 2,885,966
Debt Instrument, Interest Rate During Period | 1.83% | 1.04%
Long-term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 1.93% | 1.23%
Due year two [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.13% |
Due year three [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.38% |
Due year four [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.31% |
Due year five [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.14% |
Due after five years [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.27% |

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