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Risk Management - FV Input Level - Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Gross amount $ 178 $ 299
Energy commodity derivative contracts    
Derivative [Line Items]    
Gross amount 140 259
Contracts available for netting (16) (186)
Cash collateral held(b) 0 0
Net amount 124 73
Interest rate contracts    
Derivative [Line Items]    
Gross amount 38 40
Contracts available for netting 0 0
Cash collateral held(b) 0 0
Net amount 38 40
Level 1 | Energy commodity derivative contracts    
Derivative [Line Items]    
Gross amount 65 115
Level 1 | Interest rate contracts    
Derivative [Line Items]    
Gross amount 0 0
Level 2 | Energy commodity derivative contracts    
Derivative [Line Items]    
Gross amount 75 144
Level 2 | Interest rate contracts    
Derivative [Line Items]    
Gross amount 38 40
Level 3 | Energy commodity derivative contracts    
Derivative [Line Items]    
Gross amount 0 0
Level 3 | Interest rate contracts    
Derivative [Line Items]    
Gross amount $ 0 $ 0