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Goodwill and Other Intangibles - Components of Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 10, 2023
Dec. 31, 2023
Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   $ 4,244 $ 4,147
Purchases   475 430
Acquisition of businesses   2,803 55
Usage/Sales/Retirements   (474) (374)
Write-off of fully amortized balances   (72) (14)
Other   4 0
Balance at end of period   6,921 4,244
Less accumulated amortization   (2,994) (2,112)
Net carrying amount   3,927 2,132
STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   (59)  
Vivint      
Finite-lived Intangible Assets [Roll Forward]      
Weighted average useful life, years 10 years    
Renewables Energy Certificates      
Finite-lived Intangible Assets [Roll Forward]      
Carrying value   177 186
Emission Allowances      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   624 634
Purchases   10 26
Acquisition of businesses   0 0
Usage/Sales/Retirements   0 (33)
Write-off of fully amortized balances   (1) (14)
Other   (5) 11
Balance at end of period   628 624
Less accumulated amortization   (533) (528)
Net carrying amount   95 96
Emission Allowances | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Customer and Supply Contracts      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   635 638
Purchases   0 0
Acquisition of businesses   0 0
Usage/Sales/Retirements   0 0
Write-off of fully amortized balances   (28) 0
Other   2 (3)
Balance at end of period   609 635
Less accumulated amortization   (328) (235)
Net carrying amount   281 400
Customer and Supply Contracts | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Customer Relationships      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   1,730 1,679
Purchases   0 0
Acquisition of businesses   1,773 55
Usage/Sales/Retirements   0 0
Write-off of fully amortized balances   (43) 0
Other   4 (4)
Balance at end of period   3,464 1,730
Less accumulated amortization   (1,300) (787)
Net carrying amount   2,164 $ 943
Weighted average useful life, years     6 years
Customer Relationships | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Customer Relationships | Vivint      
Finite-lived Intangible Assets [Roll Forward]      
Weighted average useful life, years 12 years    
Marketing Partnerships      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   284 $ 284
Purchases   0 0
Acquisition of businesses   10 0
Usage/Sales/Retirements   0 0
Write-off of fully amortized balances   0 0
Other   1 0
Balance at end of period   295 284
Less accumulated amortization   (170) (146)
Net carrying amount   125 138
Marketing Partnerships | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Technology      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   0  
Purchases   0  
Acquisition of businesses   860  
Usage/Sales/Retirements   0  
Write-off of fully amortized balances   0  
Other   0  
Balance at end of period   860 0
Less accumulated amortization   (230)  
Net carrying amount   630  
Technology | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Technology | Vivint      
Finite-lived Intangible Assets [Roll Forward]      
Weighted average useful life, years 5 years    
Trade Names      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   679 683
Purchases   0 0
Acquisition of businesses   160 0
Usage/Sales/Retirements   0 0
Write-off of fully amortized balances   0 0
Other   2 (4)
Balance at end of period   841 679
Less accumulated amortization   (401) (341)
Net carrying amount   440 338
Trade Names | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   0  
Trade Names | Vivint      
Finite-lived Intangible Assets [Roll Forward]      
Weighted average useful life, years 10 years    
Other      
Finite-lived Intangible Assets [Roll Forward]      
Balance at beginning of period   292 229
Purchases   465 404
Acquisition of businesses   0 0
Usage/Sales/Retirements   (474) (341)
Write-off of fully amortized balances   0 0
Other   0 0
Balance at end of period   224 292
Less accumulated amortization   (32) (75)
Net carrying amount   192 $ 217
Other | STP | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Finite-lived Intangible Assets [Roll Forward]      
Sale of STP   (59)  
Net carrying amount   $ 47