Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets at beginning of year $ 55    
Fair value of plan assets at end of year 0 $ 55  
U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 41,069 36,846  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 38,194 34,210  
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 31,215 28,887  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 41,069 36,846  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 38,194 34,210  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 31,215 28,887  
Projected benefit obligation at beginning of year 36,846 37,521  
Service cost 1,412 1,527 $ 1,137
Interest cost 1,828 1,694 1,604
Defined Benefit Plan, Benefits Paid 1,885 1,056  
Defined Benefit Plan, Contributions by Plan Participants 0 0  
Defined Benefit Plan, Plan Amendments 285 0  
Defined Benefit Plan, Actuarial Gain (Loss) (2,583) 2,840  
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) 0 0  
Defined Benefit Plan, Purchases, Sales, and Settlements 0 0  
Defined Benefit Plan Other Benefit Obligations 0 0  
Projected benefit obligation at end of year 41,069 36,846 37,521
Fair value of plan assets at beginning of year 28,887 28,828  
Defined Benefit Plan, Actual Return on Plan Assets 1,735 67  
Defined Benefit Plan, Contributions by Employer 2,478 1,048  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 0 0  
Defined Benefit Plan, Settlements, Plan Assets 0 0  
Defined Benefit Plan Other Fair Value Of Plan Assets 0 0  
Fair value of plan assets at end of year 31,215 28,887 28,828
U.S. Postretirement Medical Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 2,673 2,883  
Service cost 28 34 62
Interest cost 124 117 152
Defined Benefit Plan, Benefits Paid 264 261  
Defined Benefit Plan, Contributions by Plan Participants 27 21  
Defined Benefit Plan, Plan Amendments 15 0  
Defined Benefit Plan, Actuarial Gain (Loss) (126) 120  
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) 0 0  
Defined Benefit Plan, Purchases, Sales, and Settlements 0 0  
Defined Benefit Plan Other Benefit Obligations 1 (1)  
Projected benefit obligation at end of year 2,730 2,673 2,883
Fair value of plan assets at beginning of year 130 259  
Defined Benefit Plan, Actual Return on Plan Assets 3 0  
Defined Benefit Plan, Contributions by Employer 119 111  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 0 0  
Defined Benefit Plan, Settlements, Plan Assets 0 0  
Defined Benefit Plan Other Fair Value Of Plan Assets 0 0  
Fair value of plan assets at end of year 15 130 259
International Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 1,370 493  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 1,238 416  
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 1,020 247  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 1,365 477  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 1,234 401  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 1,016 232  
Projected benefit obligation at beginning of year 1,219 1,274  
Service cost 49 48 43
Interest cost 41 44 49
Defined Benefit Plan, Benefits Paid 28 30  
Defined Benefit Plan, Contributions by Plan Participants 3 3  
Defined Benefit Plan, Plan Amendments 0 (2)  
Defined Benefit Plan, Actuarial Gain (Loss) (208) (13)  
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) (67) (138)  
Defined Benefit Plan, Purchases, Sales, and Settlements 3 3  
Defined Benefit Plan Other Benefit Obligations 3 10  
Projected benefit obligation at end of year 1,425 1,219 1,274
Fair value of plan assets at beginning of year 1,014 1,042  
Defined Benefit Plan, Actual Return on Plan Assets 108 43  
Defined Benefit Plan, Contributions by Employer 71 70  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets (73) (113)  
Defined Benefit Plan, Settlements, Plan Assets 3 3  
Defined Benefit Plan Other Fair Value Of Plan Assets 0 2  
Fair value of plan assets at end of year $ 1,092 $ 1,014 $ 1,042