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Investments and Restricted Cash and Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Investments [Abstract]      
Investments $ 1,711   $ 1,719
Equity Method Investments [Abstract]      
Equity Method Investments 4,053   3,947
Restricted Cash and Investments [Abstract]      
Restricted cash and investments 774   829
Investments, including equity method investments and restricted cash and investments 6,538   6,495
Investments, including equity method investments and restricted cash and investments, current 245   240
Investments, including equity method investments and restricted cash and investments, noncurrent 6,293   6,255
Gain on Sale of Investments 27 $ (68)  
Marketable Securities, Realized Gain (Loss) 2 0  
Marketable Securities, Gain (Loss) 25 $ (68)  
Quad Cities Station nuclear decommissioning trust funds [Member]      
Restricted Cash and Investments [Abstract]      
Decommissioning fund investments, fair value 541   599
Other restricted cash and investments [Member]      
Restricted Cash and Investments [Abstract]      
Restricted cash and investments 233   230
Equity Method Investments, tax equity investments [Member]      
Equity Method Investments [Abstract]      
Equity Method Investments 3,232   3,130
ETT [Member]      
Equity Method Investments [Abstract]      
Equity Method Investments 562   555
Bridger Coal Company [Member]      
Equity Method Investments [Abstract]      
Equity Method Investments 77   81
Other equity method investments [Member]      
Equity Method Investments [Abstract]      
Equity Method Investments 182   181
BYD Company Limited common stock [Member]      
Investments [Abstract]      
Available-for-sale securities, equity securities 1,176   1,122
Rabbi trusts [Member]      
Investments [Abstract]      
Rabbi trusts, amount 364   410
Other investments [Member]      
Investments [Abstract]      
Other investments $ 171   $ 187