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)

v3.8.0.1
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, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) $ 956    
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 8 $ 0  
Pension Benefits | U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 37,113 41,069  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 35,538 38,194  
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 32,914 31,215  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 37,113 41,069  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 35,538 38,194  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 32,914 31,215  
Projected benefit obligation at beginning of year 41,069 36,846  
Service cost 1,543 1,412 $ 1,527
Interest cost 1,813 1,828 1,694
Gross benefits paid (1,309) (1,885)  
Plan participants’ contributions 0 0  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 285  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (4,256) (2,583)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements 1,525 0  
Defined Benefit Plan Other Benefit Obligations 0 0  
Projected benefit obligation at end of year 45,847 41,069 36,846
Fair value of plan assets at beginning of year 31,215 28,887  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 4,717 1,735  
Defined Benefit Plan, Plan Assets, Contributions by Employer 7,309 2,478  
Gross benefits paid (1,309) (1,885)  
Plan participants’ contributions 0 0  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Fair value of plan assets at end of year 41,932 31,215 28,887
Pension Benefits | International Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 1,138 1,370  
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 992 1,238  
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets 798 1,020  
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 647 1,365  
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 549 1,234  
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets 342 1,016  
Projected benefit obligation at beginning of year 1,425 1,219  
Service cost 60 49 48
Interest cost 40 41 44
Gross benefits paid (32) (28)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (26) (208)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 129 (67)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements 3 3  
Defined Benefit Plan Other Benefit Obligations 3 3  
Projected benefit obligation at end of year 1,651 1,425 1,219
Fair value of plan assets at beginning of year 1,092 1,014  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 96 108  
Defined Benefit Plan, Plan Assets, Contributions by Employer 77 71  
Gross benefits paid (32) (28)  
Plan participants’ contributions 3 3  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 100 (73)  
Defined Benefit Plan, Plan Assets, Payment for Settlement 3 3  
Fair value of plan assets at end of year 1,333 1,092 1,014
Postemployment Retirement Benefits | U.S. Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of year 2,730 2,673  
Service cost 29 28 34
Interest cost 112 124 117
Gross benefits paid (264) (264)  
Plan participants’ contributions 26 27  
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 15  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (159) (126)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements 0 0  
Defined Benefit Plan Other Benefit Obligations 0 1  
Projected benefit obligation at end of year 2,792 2,730 2,673
Fair value of plan assets at beginning of year 15 130  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) (2) 3  
Defined Benefit Plan, Plan Assets, Contributions by Employer 408 119  
Gross benefits paid (264) (264)  
Plan participants’ contributions 26 27  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Fair value of plan assets at end of year $ 183 $ 15 $ 130