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Exit Activities - Schedule of Retention Benefit Liability Roll Forward (Details) - USD ($)
$ in Millions
3 Months Ended 18 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Restructuring Reserve [Roll Forward]        
Other current liabilities $ 155   $ 155 $ 156
Retention Benefits | D.E. Karn Generating Complex        
Restructuring Reserve [Roll Forward]        
Retention benefit liability at beginning of period 11 $ 4    
Costs incurred and charged to maintenance and other operating expenses 0 4 16  
Costs deferred as a regulatory asset 2 0    
Retention benefit liability at the end of the period 13 8 13  
Other current liabilities $ 4 $ 4 $ 4