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Risk Management - Derivative Liabilities Input Level (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ (906) $ (293)
Energy commodity derivative contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (796) (272)
Contracts available for netting 75 53
Cash collateral posted 196 0
Net amount (525) (219)
Energy commodity derivative contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (141) (15)
Energy commodity derivative contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (655) (257)
Energy commodity derivative contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Interest rate contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (98) (18)
Contracts available for netting 25 9
Cash collateral posted 0 0
Net amount (73) (9)
Interest rate contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Interest rate contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (98) (18)
Interest rate contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Foreign currency contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (12) (3)
Contracts available for netting 11 3
Cash collateral posted 0 0
Net amount (1) 0
Foreign currency contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Foreign currency contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount (12) (3)
Foreign currency contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ 0 $ 0