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Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits    
Amounts recognized in the consolidated balance sheets consist of:    
Noncurrent asset $ 9 $ 2
Current liability (8) (8)
Noncurrent liability (1,921) (1,892)
Total liability (1,920) (1,898)
Amounts recognized in accumulated other comprehensive income (loss) consist of:    
Net actuarial gain (loss) (1,610) (1,482)
Prior service credit (loss) (1) (1)
Total accumulated other comprehensive income (loss) (1,611) (1,483)
Other Postretirement Benefits    
Amounts recognized in the consolidated balance sheets consist of:    
Current liability (54) (51)
Noncurrent liability (1,602) (1,581)
Total liability (1,656) (1,632)
Amounts recognized in accumulated other comprehensive income (loss) consist of:    
Net actuarial gain (loss) 301 384
Prior service credit (loss) 208 245
Total accumulated other comprehensive income (loss) $ 509 $ 629