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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 3 $ (3) $ 9 $ (10)
Pension Plan        
Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) (1) 0 0 0
Other Benefit Plans        
Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) 2 1 4 3
Derivative Instruments        
Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) 2 (4) 5 (13)
Unrealized Gain (loss) on Investments        
Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 0 $ 0 $ 0 $ 0