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Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits    
Amounts recognized in the consolidated balance sheets consist of:    
Noncurrent asset $ 2 $ 2
Current liability (8) (12)
Noncurrent liability (1,892) (1,488)
Total liability (1,898) (1,498)
Amounts recognized in accumulated other comprehensive income (loss) consist of:    
Net actuarial gain (loss) (1,482) (844)
Prior service credit (loss) (1) (1)
Total accumulated other comprehensive income (loss) (1,483) (845)
Other Postretirement Benefits    
Amounts recognized in the consolidated balance sheets consist of:    
Current liability (51) (64)
Noncurrent liability (1,581) (1,882)
Total liability (1,632) (1,946)
Amounts recognized in accumulated other comprehensive income (loss) consist of:    
Net actuarial gain (loss) 384 236
Prior service credit (loss) 245 246
Total accumulated other comprehensive income (loss) $ 629 $ 482