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Goodwill and Other Intangibles - Schedule of Estimated Amortization of Intangible Asset for the Next Five Years (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 $ 149
2022 128
2023 127
2024 91
2025 70
Emission Allowances  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 31
2022 30
2023 30
2024 31
2025 29
Fuel Contracts  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 0
2022 1
2023 0
2024 1
2025 0
Customer Relationships  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 64
2022 44
2023 45
2024 16
2025 5
Marketing Partnerships  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 24
2022 23
2023 23
2024 23
2025 22
Trade Names  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 27
2022 27
2023 26
2024 17
2025 11
Other(b)  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 3
2022 3
2023 3
2024 3
2025 $ 3