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)

v3.3.1.900
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, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Document Fiscal Year Focus 2015    
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year $ 30,129    
Fair value of plan assets at end of year 30,031 $ 30,129  
U.S. Pension Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 37,521    
Service cost 1,527 1,137 $ 1,349
Interest cost 1,694 1,604 1,449
Projected benefit obligation at end of year 36,846 37,521  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 28,828    
Fair value of plan assets at end of year 28,887 28,828  
U.S. Postretirement Medical Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 2,883    
Service cost 34 62 103
Interest cost 117 152 185
Projected benefit obligation at end of year 2,673 2,883  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 259    
Fair value of plan assets at end of year 130 259  
International Pension Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 1,274    
Service cost 48 43 47
Interest cost 44 49 44
Projected benefit obligation at end of year 1,219 1,274  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 1,042    
Fair value of plan assets at end of year 1,014 1,042  
Benefit Obligations [Member] | U.S. Pension Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 37,521 29,508  
Service cost 1,527 1,137  
Interest cost 1,694 1,604  
Gross benefits paid (1,056) (924)  
Plan participants’ contributions 0 0  
Plan amendments 0 5  
Actuarial (gain)/loss (2,840) 6,191  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Projected benefit obligation at end of year 36,846 37,521 29,508
Fair Value of Plan Assets:      
Plan participants’ contributions 0 0  
Gross benefits paid (1,056) (924)  
Benefit Obligations [Member] | U.S. Postretirement Medical Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 2,883 4,046  
Service cost 34 62  
Interest cost 117 152  
Gross benefits paid (262) (255)  
Plan participants’ contributions 21 15  
Plan amendments 0 65  
Actuarial (gain)/loss (120) 1,069  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 (2,271)  
Other 0 0  
Projected benefit obligation at end of year 2,673 2,883 4,046
Fair Value of Plan Assets:      
Plan participants’ contributions 21 15  
Gross benefits paid (262) (255)  
Benefit Obligations [Member] | International Pension Benefits      
Benefit Obligations:      
Projected benefit obligation at beginning of year 1,274 1,076  
Service cost 48 43  
Interest cost 44 49  
Gross benefits paid (30) (26)  
Plan participants’ contributions 6 5  
Plan amendments (2) 0  
Actuarial (gain)/loss 13 194  
Foreign currency exchange rate changes (138) (103)  
Curtailments and settlements (3) (2)  
Other 7 38  
Projected benefit obligation at end of year 1,219 1,274 1,076
Fair Value of Plan Assets:      
Plan participants’ contributions 6 5  
Gross benefits paid (30) (26)  
Fair Value of Plan Assets [Member] | U.S. Pension Benefits      
Benefit Obligations:      
Gross benefits paid (1,056) (924)  
Plan participants’ contributions 0 0  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 28,828 26,224  
Actual return on plan assets 67 2,471  
Employer contributions 1,048 1,057  
Plan participants’ contributions 0 0  
Gross benefits paid (1,056) (924)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Fair value of plan assets at end of year 28,887 28,828 26,224
Fair Value of Plan Assets [Member] | U.S. Postretirement Medical Benefits      
Benefit Obligations:      
Gross benefits paid (261) (255)  
Plan participants’ contributions 21 15  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 259 355  
Actual return on plan assets 0 22  
Employer contributions 111 122  
Plan participants’ contributions 21 15  
Gross benefits paid (261) (255)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Fair value of plan assets at end of year 130 259 355
Fair Value of Plan Assets [Member] | International Pension Benefits      
Benefit Obligations:      
Gross benefits paid (30) (26)  
Plan participants’ contributions 3 3  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 1,042 931  
Actual return on plan assets 43 106  
Employer contributions 70 79  
Plan participants’ contributions 3 3  
Gross benefits paid (30) (26)  
Foreign currency exchange rate changes (113) (79)  
Curtailments and settlements (3) (2)  
Other 2 30  
Fair value of plan assets at end of year $ 1,014 $ 1,042 $ 931