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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, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   $ (320)   $ (144) $ (320) $ (144)
Other comprehensive income (loss), before reclassifications, net of tax         (12) (6)
Amounts reclassified from accumulated other comprehensive loss:            
Amortization - prior service credit         (23) (23)
Amortization - actuarial loss         19 10
Amortization - settlement loss         1 2
Other         (3) (3)
Tax effect         2 3
Other comprehensive income (loss) $ (10) (6) $ (10) (7) (16) (17)
Ending balance (336)   (161)   (336) (161)
Other comprehensive income (loss) before reclassifications, tax         4 3
Accumulated Defined Benefit Plans Adjustment | Pension Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   (212)   (132) (212) (132)
Other comprehensive income (loss), before reclassifications, net of tax         (10) (7)
Amounts reclassified from accumulated other comprehensive loss:            
Amortization - prior service credit [1]         (23) (23)
Amortization - actuarial loss [1]         18 11
Amortization - settlement loss [1]         1 2
Tax effect         1 2
Other comprehensive income (loss)         (13) (15)
Ending balance (225)   (147)   (225) (147)
Accumulated Defined Benefit Plans Adjustment | Other Benefits            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   (116)   (23) (116) (23)
Other comprehensive income (loss), before reclassifications, net of tax         (2) 1
Amounts reclassified from accumulated other comprehensive loss:            
Amortization - prior service credit [1]         0 0
Amortization - actuarial loss [1]         1 (1)
Amortization - settlement loss         0 0
Tax effect         0 0
Other comprehensive income (loss)         (1) 0
Ending balance (117)   (23)   (117) (23)
Gain on Cash Flow Hedge            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   1   2 1 2
Other comprehensive income (loss), before reclassifications, net of tax         0 0
Amounts reclassified from accumulated other comprehensive loss:            
Tax effect         0 0
Other comprehensive income (loss)         0 0
Ending balance 1   2   1 2
Workers Compensation            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance   $ 7   $ 9 7 9
Other comprehensive income (loss), before reclassifications, net of tax         0 0
Amounts reclassified from accumulated other comprehensive loss:            
Other         (3) (3)
Tax effect         1 1
Other comprehensive income (loss)         (2) (2)
Ending balance $ 5   $ 7   $ 5 $ 7
[1]
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.