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Acquisitions and Dispositions - Dispositions Narrative (Details) - USD ($)
$ in Millions
Sep. 16, 2024
Nov. 01, 2023
Oct. 02, 2023
Jan. 06, 2023
Jun. 01, 2022
Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Not Discontinued Operation, Gain Loss on Disposal Statement of Income Extensible List Not Disclosed Flag     82 million      
STP            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage           44.00%
Watson Facility            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage         49.00%  
Proceeds from sale of investment         $ 59  
Gain on sale of investment         $ 46  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gregory            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale     $ 102      
Gain on sale     $ 82      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gregory | Gregory            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage, parent     100.00%      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other | Airtron            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of equity interest $ 500          
Working capital and other adjustments, net 20          
Proceeds from sale of, net of working capital adjustments 480          
Gain on sale of business $ 204          
Disposal Group, Disposed of by Sale, Not Discontinued Operations | West/Services/Other | Airtron | Airtron            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership percentage, parent 100.00%          
Disposal Group, Disposed of by Sale, Not Discontinued Operations | East            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of land and related generation assets       $ 212    
Transaction fees on disposal       3    
Gain on sale of land and related generation assets       $ 199    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | STP            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of, net of working capital adjustments   $ 1,654        
Ownership percentage   44.00%        
Proceeds from sale   $ 1,750        
Working capital adjustments   96        
Gain on sale   $ 1,200