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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 2,051 $ 1,742
Purchases 70 42
Acquisition of businesses 22 318
Usage/Retirements (35) (21)
Write-off of fully amortized balances (74) (30)
Impairment (14) (2)
Other 5 2
Balance at end of period 2,025 2,051
Less accumulated amortization (1,357) (1,262)
Net carrying amount 668 789
Renewables Energy Certificates    
Finite-lived Intangible Assets [Roll Forward]    
Carrying value 28 18
Emission Allowances    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 662 659
Purchases 25 13
Acquisition of businesses 0 0
Usage/Retirements 0 (4)
Write-off of fully amortized balances (4) (8)
Impairment (14) 0
Other 3 2
Balance at end of period 672 662
Less accumulated amortization (563) (539)
Net carrying amount 109 123
Fuel Contracts    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 49 49
Purchases 0 0
Acquisition of businesses 0 0
Usage/Retirements 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 (46) (45)
Net carrying amount 3 4
Customer Relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 573 478
Purchases 0 0
Acquisition of businesses 22 110
Usage/Retirements 0 0
Write-off of fully amortized balances (70) (13)
Impairment 0 (2)
Other 2 0
Balance at end of period 527 573
Less accumulated amortization (349) (345)
Net carrying amount $ 178 $ 228
Weighted average useful life, years 5 years 7 years
Marketing Partnerships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period $ 285 $ 131
Purchases 0 0
Acquisition of businesses 0 154
Usage/Retirements 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 285 285
Less accumulated amortization (99) (75)
Net carrying amount 186 $ 210
Weighted average useful life, years   9 years
Trade Names    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 373 $ 345
Purchases 0 0
Acquisition of businesses 0 28
Usage/Retirements 0 0
Write-off of fully amortized balances 0 0
Impairment 0 0
Other 0 0
Balance at end of period 373 373
Less accumulated amortization (247) (220)
Net carrying amount 126 $ 153
Weighted average useful life, years   12 years
Other(b)    
Finite-lived Intangible Assets [Roll Forward]    
Balance at beginning of period 109 $ 80
Purchases 45 29
Acquisition of businesses 0 26
Usage/Retirements (35) (17)
Write-off of fully amortized balances 0 (9)
Impairment 0 0
Other 0 0
Balance at end of period 119 109
Less accumulated amortization (53) (38)
Net carrying amount $ 66 $ 71
Energy Supply Contract    
Finite-lived Intangible Assets [Roll Forward]    
Weighted average useful life, years   2 years