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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2022 | May 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Finance leases | $ 1,320 |  |  | $ 1,261
Net unamortized premiums, discounts and debt issuance costs | 532 |  |  | (907)
Total debt | 16,643 |  |  | 19,934
Short-term debt | (417) |  |  | (1,200)
Long-term debt | $ 16,226 |  |  | 18,734
2.40% Notes due 2022 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.40% |  |  |
Long-term and short-term, combined amount, gross | $ 0 |  |  | 329
7.65% Debentures due 2023 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.65% |  |  |
Long-term and short-term, combined amount, gross | $ 78 |  |  | 78
3.35% Notes due 2024 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.35% |  |  |
Long-term and short-term, combined amount, gross | $ 426 |  |  | 426
2.125% Notes due 2024 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.125% |  | 2.125% |
Long-term and short-term, combined amount, gross | $ 900 |  |  | 0
8.2% Notes due 2025 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 8.20% |  |  |
Long-term and short-term, combined amount, gross | $ 134 |  |  | 134
3.35% Debentures due 2025 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.35% |  |  |
Long-term and short-term, combined amount, gross | $ 199 |  |  | 199
2.40% Notes due 2025 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.40% |  | 2.40% |
Long-term and short-term, combined amount, gross | $ 900 |  |  | 0
6.875% Debentures due 2026 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.875% |  |  |
Long-term and short-term, combined amount, gross | $ 67 |  |  | 67
4.95% Notes due 2026 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.95% | 4.95% |  |
Long-term and short-term, combined amount, gross | $ 0 |  |  | 1,250
7.8% Debentures due 2027 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.80% |  |  |
Long-term and short-term, combined amount, gross | $ 203 |  |  | 203
3.75% Notes due 2027 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.75% |  |  |
Long-term and short-term, combined amount, gross | $ 196 |  |  | 1,000
4.3% Notes due 2028 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.30% |  |  |
Long-term and short-term, combined amount, gross | $ 223 |  |  | 1,000
7.375% Debentures due 2029 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.375% |  |  |
Long-term and short-term, combined amount, gross | $ 92 |  |  | 92
7.0% Debentures due 2029 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.00% |  |  |
Long-term and short-term, combined amount, gross | $ 112 |  |  | 200
6.95% Notes due 2029 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.95% |  |  |
Long-term and short-term, combined amount, gross | $ 1,195 |  |  | 1,549
8.125% Notes due 2030 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 8.125% |  |  |
Long-term and short-term, combined amount, gross | $ 390 |  |  | 390
7.4% Notes due 2031 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.40% |  |  |
Long-term and short-term, combined amount, gross | $ 382 |  |  | 500
7.25% Notes due 2031 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.25% |  |  |
Long-term and short-term, combined amount, gross | $ 400 |  |  | 500
7.2% Notes due 2031 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.20% |  |  |
Long-term and short-term, combined amount, gross | $ 447 |  |  | 575
2.4% Notes due 2031 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.40% |  |  |
Long-term and short-term, combined amount, gross | $ 227 |  |  | 500
5.9% Notes due 2032 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.90% |  |  |
Long-term and short-term, combined amount, gross | $ 505 |  |  | 505
4.15% Notes due 2034 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.15% |  |  |
Long-term and short-term, combined amount, gross | $ 246 |  |  | 246
5.95% Notes due 2036 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.95% |  |  |
Long-term and short-term, combined amount, gross | $ 326 |  |  | 500
5.951% Notes due 2037 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.951% |  |  |
Long-term and short-term, combined amount, gross | $ 631 |  |  | 645
5.9% Notes due 2038 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.90% |  |  |
Long-term and short-term, combined amount, gross | $ 350 |  |  | 600
6.5% Notes due 2039 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.50% |  |  |
Long-term and short-term, combined amount, gross | $ 1,588 |  |  | 2,750
3.758% Notes due 2042 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.758% |  |  |
Long-term and short-term, combined amount, gross | $ 785 |  |  | 0
4.3% Notes due 2044 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.30% |  |  |
Long-term and short-term, combined amount, gross | $ 750 |  |  | 750
5.95% Notes due 2046 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.95% |  |  |
Long-term and short-term, combined amount, gross | $ 329 |  |  | 500
7.9% Debentures due 2047 | Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.90% |  |  |
Long-term and short-term, combined amount, gross | $ 60 |  |  | 60
4.875% Notes due 2047 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.875% |  |  |
Long-term and short-term, combined amount, gross | $ 319 |  |  | 800
4.85% Notes due 2048 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.85% |  |  |
Long-term and short-term, combined amount, gross | $ 219 |  |  | 600
3.8% Notes due 2052 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.80% |  | 3.80% |
Long-term and short-term, combined amount, gross | $ 1,100 |  |  | 0
4.025% Notes due 2062 | Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.025% |  |  |
Long-term and short-term, combined amount, gross | $ 1,770 |  |  | 0
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% – 1.12% during 2021 | Floating Rate Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term and short-term, combined amount, gross | $ 0 |  |  | $ 500
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% – 1.12% during 2021 | Floating Rate Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 1.06% |  |  | 1.02%
Floating rate notes due 2022 at 1.06% – 1.41% during 2022 and 1.02% – 1.12% during 2021 | Floating Rate Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 1.41% |  |  | 1.12%
Marine Terminal Revenue Refunding Bonds due 2031 at 0.07% – 4.10% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term and short-term, combined amount, gross | $ 265 |  |  | $ 265
Marine Terminal Revenue Refunding Bonds due 2031 at 0.07% – 4.10% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 0.07% |  |  | 0.04%
Marine Terminal Revenue Refunding Bonds due 2031 at 0.07% – 4.10% during 2022 and 0.04% – 0.15% during 2021 | Variable Rate Debt Bonds | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.10% |  |  | 0.15%
Industrial Development Bonds due 2035 at 0.07% – 4.10% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term and short-term, combined amount, gross | $ 18 |  |  | $ 18
Industrial Development Bonds due 2035 at 0.07% – 4.10% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 0.07% |  |  | 0.04%
Industrial Development Bonds due 2035 at 0.07% – 4.10% during 2022 and 0.04% – 0.12% during 2021 | Variable Rate Debt Bonds | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.10% |  |  | 0.12%
Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term and short-term, combined amount, gross | $ 23 |  |  | $ 35

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