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Leases - Maturities of Operating Lease Liabilities (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Lessee, Lease, Description [Line Items]  
2022 $ 28
2023 28
2024 28
2025 28
2026 29
Thereafter 801
Total lease payments (a) 942
Less imputed interest (352)
Lease liability 590
Thermal  
Lessee, Lease, Description [Line Items]  
2022 1
2023 1
2024 1
2025 1
2026 1
Thereafter $ 31