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Supplemental Information (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 5 $ 5  
Deferred Compensation Liability, Classified, Noncurrent $ 91   $ 91
Q1 2022 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Performance Shares | Q1 2022 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 267,849    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value $ 25    
Stock Issued During Period Percentage Conversion Of Units, Low End 0.00%    
Stock Issued During Period Percentage Conversion Of Units, High End 200.00%    
Performance Shares | Market performance measures achievement | Q1 2022 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 229,566    
Performance Shares | Renewable generation and energy storage installation targets | Q1 2022 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 38,283    
Restricted Stock Units (RSUs) | Q1 2022 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 122,882    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value $ 11