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Asset Retirement Obligations - NPC - Change in Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance $ 1,328 $ 1,340
Change in estimated costs 54 2
Additions 56 32
Retirements (64) (122)
Accretion 54 47
Ending Balance 1,428 1,328
Other current liabilities    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance 76  
Ending Balance 34 76
Other long-term liabilities    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance 1,252  
Ending Balance 1,394 1,252
NPC    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance 59 68
Change in estimated costs 6 5
Additions 3 0
Retirements (9) (16)
Accretion 3 2
Ending Balance 62 59
NPC | Other current liabilities    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance 16  
Ending Balance 9 16
NPC | Other long-term liabilities    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning Balance 43  
Ending Balance $ 53 $ 43