Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value of Plan Assets:      
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      
Benefit Obligations:      
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
Gross benefits paid (1,885) (1,056)  
Plan participants’ contributions 0 0  
Plan amendments 285 0  
Actuarial (gain)/loss 2,583 (2,840)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Projected benefit obligation at end of year 41,069 36,846 37,521
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 28,887 28,828  
Actual return on plan assets 1,735 67  
Employer contributions 2,478 1,048  
Plan participants’ contributions 0 0  
Gross benefits paid (1,885) (1,056)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Fair value of plan assets at end of year 31,215 28,887 28,828
U.S. Postretirement Medical Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 2,673 2,883  
Service cost 28 34 62
Interest cost 124 117 152
Gross benefits paid (264) (261)  
Plan participants’ contributions 27 21  
Plan amendments 15 0  
Actuarial (gain)/loss 126 (120)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 1 (1)  
Projected benefit obligation at end of year 2,730 2,673 2,883
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 130 259  
Actual return on plan assets 3 0  
Employer contributions 119 111  
Plan participants’ contributions 27 21  
Gross benefits paid (264) (261)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Fair value of plan assets at end of year 15 130 259
International Pension Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 1,219 1,274  
Service cost 49 48 43
Interest cost 41 44 49
Gross benefits paid (28) (30)  
Plan participants’ contributions 3 3  
Plan amendments 0 (2)  
Actuarial (gain)/loss 208 13  
Foreign currency exchange rate changes (67) (138)  
Curtailments and settlements (3) (3)  
Other 3 10  
Projected benefit obligation at end of year 1,425 1,219 1,274
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 1,014 1,042  
Actual return on plan assets 108 43  
Employer contributions 71 70  
Plan participants’ contributions 3 3  
Gross benefits paid (28) (30)  
Foreign currency exchange rate changes (73) (113)  
Curtailments and settlements (3) (3)  
Other 0 2  
Fair value of plan assets at end of year $ 1,092 $ 1,014 $ 1,042