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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 |

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