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AERA MERGER - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Aera Energy, LLC - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Assets Acquired    
Cash $ 137 $ 137
Measurement period adjustments, cash 0  
Accounts receivable 176 176
Measurement period adjustments, accounts receivable 0  
Inventories 29 30
Measurement period adjustments, inventories (1)  
Other current assets 62 49
Measurement period adjustments, other current assets 13  
Investment in unconsolidated subsidiary 52 59
Measurement period adjustments, investment in unconsolidated subsidiary (7)  
Property, plant and equipment 3,080 3,048
Measurement period adjustments, property, plant and equipment 32  
Pension and other postretirement benefits 73 73
Measurement period adjustments, pension and other postretirement benefits 0  
Other noncurrent assets 70 57
Measurement period adjustments, other noncurrent assets 13  
Total Assets Acquired 3,679 3,629
Measurement period adjustments, total assets acquired 50  
Liabilities Assumed    
Accounts payable (158) (158)
Measurement period adjustments, accounts payable 0  
Accrued liabilities (161) (157)
Measurement period adjustments, accrued liabilities (4)  
Asset retirement obligations (627) (646)
Measurement period adjustments, asset retirement obligations 19  
Fair value of derivative contracts (351) (351)
Measurement period adjustments, fair value of derivative contracts 0  
Pension and other postretirement benefits (35) (35)
Measurement period adjustments, pension and other postretirement benefits 0  
Deferred tax liability (171) (101)
Measurement period adjustments, deferred tax liability (70)  
Other long-term liabilities (55) (37)
Measurement period adjustments, other long-term liabilities (18)  
Total Liabilities Assumed (1,558) (1,485)
Measurement period adjustments, liabilities assumed (73)  
Net Assets Acquired 2,121 $ 2,144
Measurement period adjustments, net assets acquired $ (23)