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Goodwill and Other Intangibles - Schedule of Amortization and Retirement of Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Total amortization $ 204 $ 151 $ 133
Depreciation and amortization 435 373 421
Renewables Energy Certificates | Cost of operations      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset retirements 36 17 28
Emission Allowances      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 28 32 39
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 74 44 32
Marketing Partnerships      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 24 15 9
Trade Names      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 27 25 23
Other(b)      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 51 35 30
Depreciation and amortization $ 15 $ 18 $ 2