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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ (6) $ (10)
Pension Plan    
Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Tax Benefit (Expense) (1) 1
Other Benefit Plans    
Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Tax Benefit (Expense) 1 2
Derivative Instruments    
Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Tax Benefit (Expense) (6) (13)
Unrealized Gain (loss) on Investments    
Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 0 $ 0