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Debt and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |
Finance Lease Rate | 15.00% |
Subtotal Long-term Debt (including current portion) | $ 16,238 | $ 14,757
Finance Leases | 4 |
Less Debt Due within One Year | (245) | (18)
Long-term Debt (excluding current portion) | $ 15,993 | 14,739
Notes |  |
Debt Instrument [Line Items] |  |
Average Interest Rates | 4.40% |
Subtotal Long-term Debt (including current portion) | $ 16,056 | 14,558
Equipment Obligations |  |
Debt Instrument [Line Items] |  |
Average Interest Rates | 6.30% |
Subtotal Long-term Debt (including current portion) | $ 178 | 195
Finance Leases |  |
Debt Instrument [Line Items] |  |
Subtotal Long-term Debt (including current portion) |  | $ 4

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