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Goodwill and Identifiable Intangible Assets and Liabilities - Schedule of Amortization Expense Related to Intangible Assets Including Income Statement (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets and liabilities | $ 521 | $ 604 | $ 494
Depreciation and amortization |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets and liabilities | $ 158 | 208 | 275
Retail customer relationship | Depreciation and amortization |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Remaining useful lives of identifiable intangible assets at December 31, 2023 (weighted average in years) | 3 years |  |
Amortization of intangible assets and liabilities | $ 98 | 137 | 197
Software and other technology-related assets | Depreciation and amortization |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Remaining useful lives of identifiable intangible assets at December 31, 2023 (weighted average in years) | 4 years |  |
Amortization of intangible assets and liabilities | $ 58 | 69 | 74
Retail and wholesale contracts | Operating revenues/fuel, purchased power costs and delivery fees |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Remaining useful lives of identifiable intangible assets at December 31, 2023 (weighted average in years) | 3 years |  |
Amortization of intangible assets and liabilities | $ 8 | 7 | (56)
Other identifiable intangible assets | Fuel, purchased power costs and delivery fees |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Remaining useful lives of identifiable intangible assets at December 31, 2023 (weighted average in years) | 5 years |  |
Amortization of intangible assets and liabilities | $ 357 | $ 391 | $ 279

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 + Details
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- Definition Acquired Finite-Lived Intangible Assets and Liabilities Weighted Average Useful Life + References No definition available. + Details
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- Definition The aggregate expense (revenue) recorded to earnings to allocate the cost (benefit) of intangible assets and liabilities (nonphysical assets or liabilities not used in production) in a systematic and rational manner to the periods expected to be impacted by such assets and liabilities. As a noncash expense (revenue), this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
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