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Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   $ (67)   $ (512) $ (67) $ (512)
Other comprehensive income (loss), before reclassifications, net of tax         (22) 129
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit         (34) (22)
Amortization of actuarial loss         10 29
Settlement loss         56 49
Tax effect         (8) (13)
Other comprehensive income (loss) $ 9 (7) $ 171 1 2 172
Ending balance (65)   (340)   (65) (340)
Other comprehensive income (loss) before reclassifications, tax         (8) 44
Accumulated Defined Benefit Plans Adjustment | Pension Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   (117)   (338) (117) (338)
Other comprehensive income (loss), before reclassifications, net of tax         (19) 132
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit [1]         (23) (23)
Amortization of actuarial loss [1]         7 24
Settlement loss [1]         56 49
Tax effect         (10) (11)
Other comprehensive income (loss)         11 171
Ending balance (106)   (167)   (106) (167)
Accumulated Defined Benefit Plans Adjustment | Other Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   49   (181) 49 (181)
Other comprehensive income (loss), before reclassifications, net of tax         3 1
Amounts reclassified from accumulated other comprehensive loss:            
Amortization of prior service credit [1]         (11) 1
Amortization of actuarial loss [1]         3 5
Settlement loss         0 0
Tax effect         2 (2)
Other comprehensive income (loss)         (3) 5
Ending balance 46   (176)   46 (176)
Other            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   $ 1   $ 7 1 7
Other comprehensive income (loss), before reclassifications, net of tax         (6) (4)
Amounts reclassified from accumulated other comprehensive loss:            
Tax effect         0 0
Other comprehensive income (loss)         (6) (4)
Ending balance $ (5)   $ 3   $ (5) $ 3
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.