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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 2,080 $ 2,162
Purchases 61 59
Acquisition of businesses(a) 178 18
Usage (27) (38)
Write-off of fully amortized balances (528) (77)
Impairment (6) (20)
Other (16) (24)
Balance at end of period 1,742 2,080
Less accumulated amortization (1,151) (1,573)
Net carrying amount 591 507
Emission Allowances    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 755 780
Purchases 33 27
Acquisition of businesses(a) 0 0
Usage (1) (10)
Write-off of fully amortized balances (107) 0
Impairment (5) (20)
Other (16) (22)
Balance at end of period 659 755
Less accumulated amortization (515) (583)
Net carrying amount 144 172
Energy Supply    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 0 54
Purchases   0
Acquisition of businesses(a)   0
Usage   0
Write-off of fully amortized balances   (54)
Impairment   0
Other   0
Balance at end of period   0
Less accumulated amortization   0
Net carrying amount   0
Fuel    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 49 72
Purchases 0 0
Acquisition of businesses(a) 0 0
Usage 0 0
Write-off of fully amortized balances 0 (23)
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]    
Balance at beginning of period 1 1
Purchases 0 0
Acquisition of businesses(a) 0 0
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 1 1
Less accumulated amortization (1) (1)
Net carrying amount 0 0
Customer Relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 768 750
Purchases 0 0
Acquisition of businesses(a) 122 18
Usage 0 0
Write-off of fully amortized balances (411) 0
Impairment (1) 0
Other 0 0
Balance at end of period 478 768
Less accumulated amortization (314) (693)
Net carrying amount 164 75
Marketing Partnerships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 88 88
Purchases 0 0
Acquisition of businesses(a) 43 0
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 131 88
Less accumulated amortization (61) (54)
Net carrying amount 70 34
Trade Names    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 342 342
Purchases 0 0
Acquisition of businesses(a) 13 0
Usage 0 0
Write-off of fully amortized balances (10) 0
Impairment 0 0
Other 0 0
Balance at end of period 345 342
Less accumulated amortization (195) (182)
Net carrying amount 150 160
Other    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 77 75
Purchases 28 32
Acquisition of businesses(a) 0 0
Usage (26) (28)
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 (2)
Balance at end of period 79 77
Less accumulated amortization (20) (15)
Net carrying amount $ 59 $ 62