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Debt and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Finance Leases Average Interest Rate | 6.10% |
Subtotal Long-term Debt (including current portion) | $ 16,366 | $ 16,705
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term Debt (excluding current portion) | Long-term Debt (excluding current portion)
Finance Leases | $ 47 | $ 3
Less Debt Due within One Year | (181) | (401)
Long-term Debt (excluding current portion) | $ 16,185 | 16,304
Notes |  |
Debt Instrument [Line Items] |  |
Debt Average Interest Rates | 4.20% |
Subtotal Long-term Debt (including current portion) | $ 16,166 | 16,542
Equipment Obligations |  |
Debt Instrument [Line Items] |  |
Debt Average Interest Rates | 6.20% |
Subtotal Long-term Debt (including current portion) | $ 153 | $ 160

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