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Acquisitions and Dispositions - Held For Sale (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Current assets - held-for-sale $ 75   $ 75   $ 0
Non-current assets - held-for-sale 1,161   1,161   5
Total assets held-for-sale 1,236   1,236    
Current liabilities - held-for-sale 36   36   4
Non-current liabilities - held-for-sale 947   947   $ 31
Income before income taxes 5 $ 4 10 $ (11)  
Held-for-sale | STP          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Inventory 63   63    
Prepayments and other current assets 12   12    
Current assets - held-for-sale 75   75    
Property, plant and equipment, net 227   227    
Intangible assets, net 12   12    
Nuclear decommissioning trust fund 922   922    
Non-current assets - held-for-sale 1,161   1,161    
Current liabilities - held-for-sale 36   36    
Nuclear decommissioning reserve 336   336    
Nuclear decommissioning trust liability 551   551    
Other non-current liabilities 60   60    
Non-current liabilities - held-for-sale 947   947    
Total liabilities held-for-sale 983   983    
Income before income taxes $ 23 $ 121 $ 7 $ 156