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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 1,742 $ 2,080
Purchases 42 61
Acquisition of businesses 318 178
Usage (21) (27)
Write-off of fully amortized balances (30) (528)
Impairment (2) (6)
Other 2 (16)
Balance at end of period 2,051 1,742
Less accumulated amortization (1,262) (1,151)
Net carrying amount 789 591
Emission Allowances    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 659 755
Purchases 13 33
Acquisition of businesses 0 0
Usage (4) (1)
Write-off of fully amortized balances (8) (107)
Impairment 0 (5)
Other 2 (16)
Balance at end of period 662 659
Less accumulated amortization (539) (515)
Net carrying amount 123 144
Fuel Contracts    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 49 49
Purchases 0 0
Acquisition of businesses 0 0
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 49 49
Less accumulated amortization (45) (45)
Net carrying amount $ 4 4
Customer Contracts    
Finite-lived Intangible Assets [Roll Forward]    
Weighted average useful life, years 2 years  
Customer Relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 478 768
Purchases 0 0
Acquisition of businesses 110 122
Usage 0 0
Write-off of fully amortized balances (13) (411)
Impairment (2) (1)
Other 0 0
Balance at end of period 573 478
Less accumulated amortization (345) (314)
Net carrying amount $ 228 $ 164
Weighted average useful life, years 7 years 6 years
Marketing Partnerships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 131 $ 88
Purchases 0 0
Acquisition of businesses 154 43
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 285 131
Less accumulated amortization (75) (61)
Net carrying amount $ 210 $ 70
Weighted average useful life, years 9 years 14 years
Trade Names    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 345 $ 342
Purchases 0 0
Acquisition of businesses 28 13
Usage 0 0
Write-off of fully amortized balances 0 (10)
Impairment 0 0
Other 0 0
Balance at end of period 373 345
Less accumulated amortization (220) (195)
Net carrying amount $ 153 $ 150
Weighted average useful life, years 12 years 7 years
Other    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 80 $ 78
Purchases 29 28
Acquisition of businesses 26 0
Usage (17) (26)
Write-off of fully amortized balances (9) 0
Impairment 0 0
Other 0 0
Balance at end of period 109 80
Less accumulated amortization (38) (21)
Net carrying amount $ 71 $ 59