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Debt - Scheduled Remaining Maturity of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
2025	$ 1,766
2026	2,244
2027	3,153
2028	1,743
2029	1,752
2030 and thereafter	6,091
Total long-term debt	16,749	$ 17,495
Unsecured debt
Debt Instrument [Line Items]
2025, net of original discount	1,077
2026, net of original discount	(2)
2027, net of original discount	1,520
2028, net of original discount	789
2029, net of original discount	1,655
2030 and thereafter, net of original discount	6,043
Total long-term debt	11,082	11,062
Total long-term debt, net of original discount	11,082
Secured debt
Debt Instrument [Line Items]
Total long-term debt	5,667	$ 6,433
Long-term debt | Unsecured debt
Debt Instrument [Line Items]
2025	1,096
2026	80
2027	1,614
2028	896
2029	1,778
2030 and thereafter	6,326
Total long-term debt	11,790
Long-term debt | Secured debt
Debt Instrument [Line Items]
2025	689
2026	2,246
2027	1,633
2028	954
2029	97
2030 and thereafter	48
Total long-term debt	5,667
Original issue discount | Unsecured debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount	(708)
Original issue discount | Unsecured debt | 2025
Debt Instrument [Line Items]
Debt instrument, unamortized discount, current	(19)
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
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(123)
Original issue discount | Unsecured debt | 2030 and thereafter
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	$ (283)

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