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Commitments and Contingencies - Contractual Obligation, Fiscal Year Maturity (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Long-Term Service and Maintenance Contracts  
Long-term Purchase Commitment [Line Items]  
2024 $ 286
2025 242
2026 228
2027 250
2028 310
Thereafter 2,091
Total 3,407
Coal transportation agreements  
Long-term Purchase Commitment [Line Items]  
2024 33
2025 34
2026 35
2027 36
2028 0
Thereafter 0
Total 138
Pipeline transportation and storage reservation fees  
Long-term Purchase Commitment [Line Items]  
2024 179
2025 182
2026 192
2027 195
2028 194
Thereafter 96
Total 1,038
Water Contracts  
Long-term Purchase Commitment [Line Items]  
2024 9
2025 9
2026 9
2027 9
2028 9
Thereafter 44
Total $ 89