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Investments and Restricted Cash and Cash Equivalents and Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Investments:      
Investments $ 5,513   $ 6,600
Equity Method Investments [Abstract]      
Equity method investments 6,827   7,067
Restricted cash and cash equivalents:      
Restricted cash and investments 827   831
Investments, including equity method investments and restricted cash and investments 13,167   14,498
Investments, including equity method investments and restricted cash and investments, current 157   178
Investments, including equity method investments and restricted cash and investments, noncurrent 13,010   14,320
Marketable Securities, Gain (Loss) (1,119) $ 25  
Marketable Securities, Realized Gain (Loss) 1 2  
Gain on Sale of Investments (1,118) 27  
Equity loss (179) (18)  
Recognized Renewable Energy Production Tax Credits 315 $ 233  
Quad Cities Station nuclear decommissioning trust funds [Member]      
Restricted cash and cash equivalents:      
Decommissioning fund investments, fair value 697   676
Other restricted cash and investments [Member]      
Restricted cash and cash equivalents:      
Restricted cash and investments 130   155
Equity Method Investments, tax equity investments [Member]      
Equity Method Investments [Abstract]      
Equity method investments 5,399   5,626
Restricted cash and cash equivalents:      
Equity loss 218    
Recognized Renewable Energy Production Tax Credits 148    
Other Tax Expense (Benefit) 47    
Equity Method Investments, tax equity investments [Member] | Domestic Tax Authority and State and Local Jurisdiction      
Restricted cash and cash equivalents:      
Equity loss 23    
Iroquois Gas Transmission System L.P. [Member]      
Equity Method Investments [Abstract]      
Equity method investments 586   580
ETT [Member]      
Equity Method Investments [Abstract]      
Equity method investments 581   594
JAX LNG, LLC      
Equity Method Investments [Abstract]      
Equity method investments 80   75
Bridger Coal Company [Member]      
Equity Method Investments [Abstract]      
Equity method investments 68   74
Other equity method investments [Member]      
Equity Method Investments [Abstract]      
Equity method investments 113   118
Equity Method Investments, impacted tax equity investments      
Equity Method Investments [Abstract]      
Equity method investments 2,800    
BYD Company Limited common stock [Member]      
Investments:      
Available-for-sale securities, equity securities 4,773   5,897
Restricted cash and cash equivalents:      
Marketable Securities, Gain (Loss) 1,124    
Rabbi trusts [Member]      
Investments:      
Rabbi trusts, amount 452   440
Other investments [Member]      
Investments:      
Other investments $ 288   $ 263