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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, maturities, repayments of remainder of fiscal year | $ 3,645 |
Long-term debt, maturities, repayments of principal in next 12 months | 4,316 |
Long-term debt, maturities, repayments of principal in year two | 1,801 |
Long-term debt, maturities, repayments of principal in year three | 1,799 |
Long-term debt, maturities, repayments of principal in year four | 985 |
Long-term debt, maturities, repayments of principal after year five | 4,465 |
Total long-term debt | 17,011 | $ 17,570
Unsecured debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturities, repayments of remainder of fiscal year | 1,425 |
Long-term debt, maturities, repayments of principal in next 12 months | 2,409 |
Long-term debt, maturities, repayments of principal in year two | 70 |
Long-term debt, maturities, repayments of principal in year three | 1,442 |
Long-term debt, maturities, repayments of principal in year four | 760 |
Long-term debt, maturities, repayments of principal after year five | 4,456 |
Total long-term debt | 10,562 | 10,424
Secured debt |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 6,449 | $ 7,146
Long-term debt | Unsecured debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturities, repayments of remainder of fiscal year | 1,477 |
Long-term debt, maturities, repayments of principal in next 12 months | 2,483 |
Long-term debt, maturities, repayments of principal in year two | 152 |
Long-term debt, maturities, repayments of principal in year three | 1,536 |
Long-term debt, maturities, repayments of principal in year four | 867 |
Long-term debt, maturities, repayments of principal after year five | 4,861 |
Total long-term debt | 11,376 |
Long-term debt | Secured debt |  |
Debt Instrument [Line Items] |  |
Long-term debt, maturities, repayments of remainder of fiscal year | 2,220 |
Long-term debt, maturities, repayments of principal in next 12 months | 1,907 |
Long-term debt, maturities, repayments of principal in year two | 1,731 |
Long-term debt, maturities, repayments of principal in year three | 357 |
Long-term debt, maturities, repayments of principal in year four | 225 |
Long-term debt, maturities, repayments of principal after year five | 9 |
Total long-term debt | 6,449 |
Original issue discount | Unsecured debt |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount | (814) |
Original issue discount | Unsecured debt | 2024 |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, current | (52) |
Original issue discount | Unsecured debt | 2025 |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, noncurrent | (74) |
Original issue discount | Unsecured debt | 2026 |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, noncurrent | (82) |
Original issue discount | Unsecured debt | 2027 |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, noncurrent | (94) |
Original issue discount | Unsecured debt | 2028 |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, noncurrent | (107) |
Original issue discount | Unsecured debt | 2029 and thereafter |  |
Debt Instrument [Line Items] |  |
Debt instrument, unamortized discount, noncurrent | $ (405) |

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