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Debt and Credit Agreements - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Finance Leases Average Interest Rate | 5.90% |
Subtotal Long-term Debt (Including Current Portion) | $ 18,533 | $ 18,047
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term Debt (Excluding Current Portion) | Long-term Debt (Excluding Current Portion)
Finance Leases | $ 17 | $ 29
Less Debt Due within One Year | (558) | (151)
Long-term Debt (Excluding Current Portion) | $ 17,975 | 17,896
Notes |  |
Debt Instrument [Line Items] |  |
Debt Average Interest Rates | 4.20% |
Subtotal Long-term Debt (Including Current Portion) | $ 18,514 | 17,877
Equipment Obligations |  |
Debt Instrument [Line Items] |  |
Debt Average Interest Rates | 4.40% |
Subtotal Long-term Debt (Including Current Portion) | $ 2 | $ 141

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