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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 3,661 $ 3,721
Purchases 63 47
Acquisition of businesses 18 18
Usage (38) (45)
Write-off of fully amortized balances (77) (10)
Impairment (26) (64)
Other (37) (6)
Balance at end of period 3,564 3,661
Less accumulated amortization (1,818) (1,688)
Net carrying amount 1,746 1,973
Emission Allowances    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 789 816
Purchases 31 13
Acquisition of businesses 0 0
Usage (10) (1)
Write-off of fully amortized balances 0 (10)
Impairment (20) (23)
Other (23) (6)
Balance at end of period 767 789
Less accumulated amortization (591) (518)
Net carrying amount 176 271
Energy Supply    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 54 54
Purchases 0 0
Acquisition of businesses 0 0
Usage 0 0
Write-off of fully amortized balances (54) 0
Impairment 0 0
Other 0 0
Balance at end of period 0 54
Less accumulated amortization 0 (54)
Net carrying amount 0 0
Fuel    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 72 72
Purchases 0 0
Acquisition of businesses 0 0
Usage 0 0
Write-off of fully amortized balances (23) 0
Impairment 0 0
Other 0 0
Balance at end of period 49 72
Less accumulated amortization (45) (67)
Net carrying amount 4 5
Customer    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 16 16
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 16 16
Less accumulated amortization (9) (8)
Net carrying amount 7 8
Customer Relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 816 834
Purchases 0 0
Acquisition of businesses 18 0
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment 0 (18)
Other 0 0
Balance at end of period 834 816
Less accumulated amortization (698) (663)
Net carrying amount 136 153
Write-off of accumulated amortization included in impairment of finite lived assets   10
Marketing Partnerships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 88 88
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 88 88
Less accumulated amortization (54) (49)
Net carrying amount 34 39
Trade Names    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 342 342
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 342 342
Less accumulated amortization (182) (159)
Net carrying amount 160 183
PPA    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 1,286 1,286
Purchases 0 0
Acquisition of businesses 0  
Usage 0 0
Write-off of fully amortized balances 0 0
Impairment (6) 0
Other 5 0
Balance at end of period 1,285 1,286
Less accumulated amortization (205) (143)
Net carrying amount 1,080 1,143
Other    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 198 213
Purchases 32 34
Acquisition of businesses 0 18
Usage (28) (44)
Write-off of fully amortized balances 0 0
Impairment 0 (23)
Other (19) 0
Balance at end of period 183 198
Less accumulated amortization (34) (27)
Net carrying amount $ 149 171
Write-off of accumulated amortization included in impairment of finite lived assets   $ 8