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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     $ (144)   $ (231) $ (144) $ (231)
Other comprehensive income (loss), before reclassifications, net of tax           (57) 32
Amounts reclassified from accumulated other comprehensive loss:              
Amortization - prior service credit           (34) (27)
Amortization - actuarial loss           15 25
Amortization - settlement loss           9 47
Other           (4) (4)
Tax effect           3 (10)
Other comprehensive income (loss) $ (51) $ (10) (7) $ 65 (2) (68) 63
Ending balance (212)     (168)   (212) (168)
Other comprehensive income (loss) before reclassifications, tax           (20) 10
Accumulated Defined Benefit Plans Adjustment | Pension Benefits              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     (132)   (190) (132) (190)
Other comprehensive income (loss), before reclassifications, net of tax           (58) 35
Amounts reclassified from accumulated other comprehensive loss:              
Amortization - prior service credit [1]           (34) (25)
Amortization - actuarial loss [1]           16 26
Amortization - settlement loss [1]           9 47
Tax effect           2 (12)
Other comprehensive income (loss)           (65) 71
Ending balance (197)     (119)   (197) (119)
Accumulated Defined Benefit Plans Adjustment | Other Benefits              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     (23)   (48) (23) (48)
Other comprehensive income (loss), before reclassifications, net of tax           1 (1)
Amounts reclassified from accumulated other comprehensive loss:              
Amortization - prior service credit [1]           0 (2)
Amortization - actuarial loss [1]           (1) (1)
Amortization - settlement loss           0 0
Tax effect           0 1
Other comprehensive income (loss)           0 (3)
Ending balance (23)     (51)   (23) (51)
Gain on Cash Flow Hedge              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     2   4 2 4
Other comprehensive income (loss), before reclassifications, net of tax           0 (2)
Amounts reclassified from accumulated other comprehensive loss:              
Tax effect           0 0
Other comprehensive income (loss)           0 (2)
Ending balance 2     2   2 2
Workers Compensation              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Beginning balance     $ 9   $ 3 9 3
Other comprehensive income (loss), before reclassifications, net of tax           0 0
Amounts reclassified from accumulated other comprehensive loss:              
Other           (4) (4)
Tax effect           1 1
Other comprehensive income (loss)           (3) (3)
Ending balance $ 6     $ 0   $ 6 $ 0
[1]
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.