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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Valuation and allowance roll forward      
Beginning balance, January 1 $ 36 $ 48  
Ending balance, December 31 53 36 $ 48
Allowance for doubtful receivables      
Valuation and allowance roll forward      
Beginning balance, January 1 36 17 16
Additions charged to costs and expenses 43 33 15
Deductions (26) (14) (14)
Ending balance, December 31 53 36 17
Deferred tax valuation allowance      
Valuation and allowance roll forward      
Beginning balance, January 1 0 31 53
Additions charged to costs and expenses 0 0 0
Deductions 0 (31) (22)
Ending balance, December 31 $ 0 $ 0 $ 31