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Supplemental Information (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 5 $ 8  
Deferred Compensation Liability, Classified, Noncurrent $ 91   $ 90
January 1, 2021 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 38 months    
Performance Shares | January 1, 2021 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 293,058    
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 | January 1, 2021 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 251,177    
Performance Shares | Renewable generation and energy storage installation targets | January 1, 2021 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 41,881    
Restricted Stock Units (RSUs) | January 1, 2021 Issuance      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 125,562    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value $ 10