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Fair Value of Financial Instruments - Retail Customer Credit Risk (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Fair Value Meaurements and Concentration of Credit Risk |  |  |
Provision for credit losses (income recognized) due to loss mitigation efforts | $ 314 | $ 251 | $ 11
Winter Storm Uri |  |  |
Derivative Fair Value Meaurements and Concentration of Credit Risk |  |  |
Provision for credit losses (income recognized) due to loss mitigation efforts |  | $ (126) | $ (126)

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Details
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