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Investments and Restricted Cash and Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investments [Abstract]          
Investments $ 2,324   $ 2,324   $ 1,719
Equity Method Investments [Abstract]          
Equity Method Investments 4,954   4,954   3,947
Restricted Cash and Investments [Abstract]          
Restricted cash and investments 862   862   829
Investments, including equity method investments and restricted cash and investments 8,140   8,140   6,495
Investments, including equity method investments and restricted cash and investments, current 266   266   240
Investments, including equity method investments and restricted cash and investments, noncurrent 7,874   7,874   6,255
Gain on Sale of Investments 583 $ 6 610 $ (62)  
Marketable Securities, Realized Gain (Loss) (1) (1) 1 (1)  
Marketable Securities, Gain (Loss) 584 $ 7 609 $ (61)  
Quad Cities Station nuclear decommissioning trust funds [Member]          
Restricted Cash and Investments [Abstract]          
Decommissioning fund investments, fair value 607   607   599
Other restricted cash and investments [Member]          
Restricted Cash and Investments [Abstract]          
Restricted cash and investments 255   255   230
Equity Method Investments, tax equity investments [Member]          
Equity Method Investments [Abstract]          
Equity Method Investments 4,183   4,183   3,130
ETT [Member]          
Equity Method Investments [Abstract]          
Equity Method Investments 580   580   555
Bridger Coal Company [Member]          
Equity Method Investments [Abstract]          
Equity Method Investments 83   83   81
Other equity method investments [Member]          
Equity Method Investments [Abstract]          
Equity Method Investments 108   108   181
BYD Company Limited common stock [Member]          
Investments [Abstract]          
Available-for-sale securities, equity securities 1,737   1,737   1,122
Rabbi trusts [Member]          
Investments [Abstract]          
Rabbi trusts, amount 396   396   410
Other investments [Member]          
Investments [Abstract]          
Other investments $ 191   $ 191   $ 187