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Shareholders' Equity - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Actuarial loss reclassified to periodic benefit cost        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pension and non-pension postretirement benefit plans $ (5) $ (3) $ (18) $ (8)
Pension and OPEB plans valuation adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pension and non-pension postretirement benefit plans $ 0 $ 0 $ 2 $ 18