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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
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