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Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Detail) - Pension Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at January 1 $ 6,817    
Fair value of plan assets at December 31 8,534 $ 6,817  
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accrued benefit obligation at January 1 1,614 1,566  
Service cost 46 57 $ 64
Interest cost 62 61 67
Benefits paid (32) (32)  
Settlements paid (111) (91)  
Actuarial losses 179 52  
Divestiture 0 0  
Currency 0 0  
Other 4 1  
Accrued benefit obligation at December 31 1,762 1,614 1,566
Fair value of plan assets at January 1 1,620 1,247  
Actual return on plan assets 217 118  
Contributions 23 378  
Benefits paid (32) (32)  
Settlements paid (111) (91)  
Divestiture 0 0  
Currency 0 0  
Other 0 0  
Fair value of plan assets at December 31 1,717 1,620 1,247
Net pension (liabilities)/assets at December 31 (45) 6  
Non-U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accrued benefit obligation at January 1 9,814 9,547  
Service cost 156 147 188
Interest cost 199 229 307
Benefits paid (471) (425)  
Settlements paid 0 0  
Actuarial losses 180 1,284  
Divestiture (14) (5)  
Currency 976 (979)  
Other 12 16  
Accrued benefit obligation at December 31 10,852 9,814 9,547
Fair value of plan assets at January 1 7,926 7,721  
Actual return on plan assets 592 1,079  
Contributions 482 419  
Benefits paid (471) (425)  
Settlements paid 0 0  
Divestiture 0 (4)  
Currency 798 (863)  
Other 0 (1)  
Fair value of plan assets at December 31 9,327 7,926 $ 7,721
Net pension (liabilities)/assets at December 31 $ (1,525) $ (1,888)