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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 136.00% (46.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 21.00% 0.00%
Income tax effect of foreign income 6.00% (3.00%)
Effects of ratemaking 10.00% (8.00%)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Percent 15.00% (1.00%)
Absence of noncontrolling interest (9.00%) 0.00%
Other, net (1.00%) 1.00%
Effective income tax rate 217.00% (36.00%)
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
Related Party Tax Expense [Abstract]    
Recognized Renewable Energy Production Tax Credits $ 315 $ 233
Income tax benefit 535 184
Marketable Securities, Gain (Loss) (1,119) 25
Income before income tax expense and equity income 246 (507)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 52  
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 334  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 51  
Parent Company [Member]    
Related Party Tax Expense [Abstract]    
Related party transaction, cash paid for income taxes, net $ 0 $ 100