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Accumulated Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive (income) loss, other, after tax, beginning balance   $ (1)   $ 1 $ (1) $ 1
Accumulated other comprehensive loss, beginning balance   (114)   (131) (114) (131)
Other comprehensive income (loss), before reclassifications, net of tax         10 (2)
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit         (15) (27)
Amortization of actuarial loss         8 2
Settlement loss         1  
Other         1  
Tax effect         1 6
Other comprehensive income (loss) $ 1 5 $ (9) (12) 6 (21)
Accumulated other comprehensive (income) loss, other, after tax, ending balance 0   (2)   0 (2)
Accumulated other comprehensive loss, ending balance (108)   (152)   (108) (152)
Other comprehensive income (loss) before reclassifications, tax         3 (1)
Pension Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, beginning balance   (235)   (261) (235) (261)
Amounts reclassified from accumulated other comprehensive loss:            
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, ending balance (224)   (270)   (224) (270)
Other Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, beginning balance   $ 122   $ 129 122 129
Amounts reclassified from accumulated other comprehensive loss:            
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, ending balance $ 116   $ 120   116 120
Accumulated Defined Benefit Plans Adjustment | Pension Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive income (loss), before reclassifications, net of tax         8 2
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit [1]         (4) (16)
Amortization of actuarial loss [1]         8 2
Settlement loss [1]         1  
Tax effect         (2) 3
Other comprehensive income (loss)         11 (9)
Accumulated Defined Benefit Plans Adjustment | Other Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive income (loss), before reclassifications, net of tax         2 (1)
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit [1]         (11) (11)
Amortization of actuarial loss [1]         0 0
Settlement loss         0  
Tax effect         3 3
Other comprehensive income (loss)         (6) (9)
Other            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive income (loss), before reclassifications, net of tax         0 (3)
Amounts reclassified from accumulated other comprehensive loss:            
Other         1  
Tax effect         0 0
Other comprehensive income (loss)         $ 1 $ (3)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.