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Long-Term Debt - Scheduled Principal Payments on Long-Term Debt (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]  
2022 $ 2,395
2023 1,217
2024 2,242
2025 1,306
2026 615
All subsequent years 4,267
Key  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 0
2025 534
2026 0
All subsequent years 2,769
Subsidiaries  
Debt Instrument [Line Items]  
2022 2,395
2023 1,217
2024 2,242
2025 772
2026 615
All subsequent years $ 1,497