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Debt and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Finance Leases Average Interest Rate | 14.50% |  |
Subtotal Long-term Debt (including current portion) | $ 16,705 | $ 16,238 |
Finance Leases | 3 | 4 |
Less Debt Due within One Year | (401) | (245) | [1]
Long-term Debt (excluding current portion) | $ 16,304 | 15,993 | [1]
Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Average Interest Rates | 4.00% |  |
Subtotal Long-term Debt (including current portion) | $ 16,542 | 16,056 |
Equipment Obligations |  |  |
Debt Instrument [Line Items] |  |  |
Debt Average Interest Rates | 6.30% |  |
Subtotal Long-term Debt (including current portion) | $ 160 | $ 178 |
[1] | Certain prior year data has been reclassified to conform to the current presentation.

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