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Significant Accounting Policies - Changes in Accumulated Other Comprehensive Loss Net of Tax (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 9,366 $ 8,840 $ 9,456 $ 8,036
Other comprehensive earnings (loss), net of tax 4 2 8 3
Ending Balance 9,738 9,171 9,738 9,171
Pension and Postretirement Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (7) (46) (9) (48)
Other comprehensive earnings (loss) before reclassifications, net of tax 0   0 0
Amounts reclassified from accumulated other comprehensive loss, net of tax 5 2 7 4
Other comprehensive earnings (loss), net of tax 5 2 7 4
Ending Balance (2) (44) (2) (44)
Foreign Currency        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (2) (2) (4) (1)
Other comprehensive earnings (loss) before reclassifications, net of tax (1)   1 (1)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0 0 0
Other comprehensive earnings (loss), net of tax (1) 0 1 (1)
Ending Balance (3) (2) (3) (2)
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (9) (48) (13) (49)
Other comprehensive earnings (loss) before reclassifications, net of tax (1)   1 (1)
Amounts reclassified from accumulated other comprehensive loss, net of tax 5 2 7 4
Other comprehensive earnings (loss), net of tax 4 2 8 3
Ending Balance $ (5) $ (46) $ (5) $ (46)