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Pension Plans Resulted in Net Pension Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Prepaid pension assets $ 158 $ 159
Other current liabilities (59) (27)
Accrued pension costs (1,669) (2,014)
Total (1,570) (1,882)
Pension Plans | U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 94 96
Accumulated benefit obligation 90 88
Fair value of plan assets 2 2
Pension Plans | Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 9,345 8,386
Accumulated benefit obligation 9,138 8,168
Fair value of plan assets $ 7,709 $ 6,451