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Long-Term Debt - Scheduled Principal Payments on Long-Term Debt (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]  
2024 $ 8,708
2025 2,977
2026 1,059
2027 1,947
2028 1,184
All subsequent years 3,679
Parent  
Debt Instrument [Line Items]  
2024 0
2025 1,081
2026 0
2027 720
2028 888
All subsequent years 1,628
Subsidiaries  
Debt Instrument [Line Items]  
2024 8,708
2025 1,896
2026 1,059
2027 1,227
2028 296
All subsequent years $ 2,051