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Commodity and Other Derivative Contractual Assets and Liabilities - Schedule of Pretax Effect on Net Income of Derivatives Not Under Hedge Accounting, Including Realized and Unrealized Effects (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gain (loss) | $ (1,111) | $ (3,494) | $ (383)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total revenues | Total revenues | Total revenues
Unrealized mark-to-market net (gains) losses on interest rate swaps | $ (36) | $ 250 | $ 134
Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gain (loss) | 42 | 234 | 81
Operating revenues |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market net (gains) losses on interest rate swaps | 714 | (2,163) | (1,191)
Operating revenues | Commodity contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gain (loss) | (758) | (4,103) | (1,196)
Fuel, purchased power costs and delivery fees |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market net (gains) losses on interest rate swaps | (224) | (347) | 432
Fuel, purchased power costs and delivery fees | Commodity contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net gain (loss) | $ (395) | $ 375 | $ 732

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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