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Accumulated Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance     $ (131)     $ 2 $ (131) $ 2
Other comprehensive income (loss), before reclassifications, net of tax             0 (8)
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit             (41) (50)
Amortization of actuarial (gain) loss             5 (4)
Settlement gain               (2)
Other               (1)
Tax effect             9 14
Other comprehensive loss $ (6) $ (9) (12) $ (19) $ (21) (11) (27) (51)
Ending balance (158)     (49)     (158) (49)
Other comprehensive income (loss) before reclassifications, tax             1 (2)
Accumulated Defined Benefit Plans Adjustment | Pension Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance     (261)     (163) (261) (163)
Other comprehensive income (loss), before reclassifications, net of tax             2 (9)
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit [1]             (25) (34)
Amortization of actuarial (gain) loss [1]             5 (4)
Settlement gain [1]               (2)
Tax effect             5 10
Other comprehensive loss             (13) (39)
Ending balance (274)     (202)     (274) (202)
Accumulated Defined Benefit Plans Adjustment | Other Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance     129     165 129 165
Other comprehensive income (loss), before reclassifications, net of tax             (1) 3
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit [1]             (16) (16)
Amortization of actuarial (gain) loss [1]             0 0
Settlement gain               0
Tax effect             4 4
Other comprehensive loss             (13) (9)
Ending balance 116     156     116 156
Other                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Beginning balance     $ 1     $ 0 1 0
Other comprehensive income (loss), before reclassifications, net of tax             (1) (2)
Amounts reclassified from accumulated other comprehensive loss:                
Other               (1)
Tax effect             0 0
Other comprehensive loss             (1) (3)
Ending balance $ 0     $ (3)     $ 0 $ (3)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.