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Risk Management - Derivative Assets Input Level (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ 285 $ 514
Energy commodity derivative contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 75 76
Contracts available for netting (75) (53)
Cash collateral held 0 (20)
Net amount 0 3
Energy commodity derivative contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 35 56
Energy commodity derivative contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 40 20
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 199 397
Contracts available for netting (25) (9)
Cash collateral held 0 0
Net amount 174 388
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 199 397
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 11 41
Contracts available for netting (11) (3)
Cash collateral held 0 0
Net amount 0 38
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 11 41
Foreign currency contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ 0 $ 0