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Fuel Contracts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Coal      
Fuel Contracts [Abstract]      
2020 $ 430    
2021 222    
2022 135    
2023 58    
2024 24    
Thereafter 74    
Total 943    
Nuclear Fuel      
Fuel Contracts [Abstract]      
2020 54    
2021 103    
2022 85    
2023 103    
2024 74    
Thereafter 275    
Total 694    
Natural Gas Supply      
Fuel Contracts [Abstract]      
2020 343    
2021 254    
2022 104    
2023 53    
2024 3    
Thereafter 0    
Total 757    
Natural Gas Storage and Transportation      
Fuel Contracts [Abstract]      
2020 295    
2021 283    
2022 269    
2023 198    
2024 153    
Thereafter 860    
Total 2,058    
Capacity      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Utilities Operating Expense, Purchased Power under Long-term Contracts 86 $ 131 $ 168
Fuel Contracts [Abstract]      
2020 70    
2021 78    
2022 77    
2023 79    
2024 74    
Thereafter 56    
Total $ 434