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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (234) $ (318)
Other comprehensive loss before reclassifications (1) 0
Amounts reclassified from accumulated other comprehensive loss:    
Amortization - prior service credit (11) (12)
Amortization - actuarial loss 9 11
Amortization - settlement loss 0 1
Tax effect 0 0
Other comprehensive income (loss) (3) 0
Ending balance (237) (318)
Accumulated Defined Benefit Plans Adjustment | Pension Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (233) (255)
Other comprehensive loss before reclassifications (1) 0
Amounts reclassified from accumulated other comprehensive loss:    
Amortization - prior service credit [1] (10) (11)
Amortization - actuarial loss [1] 9 10
Amortization - settlement loss [1] 0 1
Tax effect 0 0
Other comprehensive income (loss) (2) 0
Ending balance (235) (255)
Accumulated Defined Benefit Plans Adjustment | Other Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7) (70)
Other comprehensive loss before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss:    
Amortization - prior service credit [1] (1) (1)
Amortization - actuarial loss [1] 0 1
Amortization - settlement loss 0 0
Tax effect 0 0
Other comprehensive income (loss) (1) 0
Ending balance (8) (70)
Gain on Cash Flow Hedge    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 4 4
Other comprehensive loss before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss:    
Tax effect 0 0
Other comprehensive income (loss) 0 0
Ending balance 4 4
Workers Compensation    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 2 3
Other comprehensive loss before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss:    
Tax effect 0 0
Other comprehensive income (loss) 0 0
Ending balance $ 2 $ 3
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 19.