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Goodwill and Other Intangibles - Schedule of Amortization Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Total amortization $ 151 $ 133 $ 166
Emission Allowances      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 32 39 71
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 44 32 34
Marketing Partnerships      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 15 9 5
Trade Names      
Finite-Lived Intangible Assets [Line Items]      
Total amortization 25 23 23
Other      
Finite-Lived Intangible Assets [Line Items]      
Total amortization $ 35 $ 30 $ 33