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Risk Management and Hedging Activities - PAC - Balance Sheet Location (Details) - PAC - Commodity derivatives - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net $ 270 $ 53    
Cash collateral receivable (payable) (78) 5    
Total derivatives - net basis 192 58    
Cash collateral payable, not offset 12      
Other current assets        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 257 76    
Cash collateral receivable (payable) (73) 0    
Total derivatives - net basis 184 76    
Other non-current assets        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net 20 20    
Cash collateral receivable (payable) (5) 0    
Total derivatives - net basis 15 20    
Other current liabilities        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (5) (36)    
Cash collateral receivable (payable) 0 5    
Total derivatives - net basis (5) (31)    
Other long-term liabilities        
Derivatives, Fair Value [Line Items]        
Derivative, fair value, net (2) (7)    
Cash collateral receivable (payable) 0 0    
Total derivatives - net basis (2) (7)    
Not designated as hedging contracts        
Derivatives, Fair Value [Line Items]        
Derivative asset, not subject to master netting arrangement 318 104    
Derivative liability, not subject to master netting arrangement (48) (51)    
Derivative, fair value, net 270 53    
Net regulatory asset (liability) on derivative contracts (270) (53) $ 17 $ 62
Not designated as hedging contracts | Other current assets        
Derivatives, Fair Value [Line Items]        
Derivative asset, not subject to master netting arrangement 279 81    
Derivative liability, not subject to master netting arrangement (22) (5)    
Derivative, fair value, net 257 76    
Not designated as hedging contracts | Other non-current assets        
Derivatives, Fair Value [Line Items]        
Derivative asset, not subject to master netting arrangement 27 21    
Derivative liability, not subject to master netting arrangement (7) (1)    
Derivative, fair value, net 20 20    
Not designated as hedging contracts | Other current liabilities        
Derivatives, Fair Value [Line Items]        
Derivative asset, not subject to master netting arrangement 9 2    
Derivative liability, not subject to master netting arrangement (14) (38)    
Derivative, fair value, net (5) (36)    
Not designated as hedging contracts | Other long-term liabilities        
Derivatives, Fair Value [Line Items]        
Derivative asset, not subject to master netting arrangement 3 0    
Derivative liability, not subject to master netting arrangement (5) (7)    
Derivative, fair value, net $ (2) $ (7)