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Shareholders' Equity - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Actuarial loss reclassified to periodic benefit cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pension and non-pension postretirement benefit plans $ (6) $ (6)
Pension and OPEB plans valuation adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pension and non-pension postretirement benefit plans $ 12 $ 2