Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (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    
U.S. Pension Benefits      
Net Periodic Benefit Cost:      
Service cost $ 1,527 $ 1,137 $ 1,349
Interest cost 1,694 1,604 1,449
Expected return on assets (2,489) (2,257) (2,147)
Amortization of:      
Transition obligation 0 0 0
Prior service cost 168 169 172
Actuarial (gain) loss 70 991 0
Curtailment and settlement loss 0 0 0
Defined Benefit Plan, Curtailments 0 0 0
Net periodic benefit cost 970 1,644 823
U.S. Postretirement Medical Benefits      
Net Periodic Benefit Cost:      
Service cost 34 62 103
Interest cost 117 152 185
Expected return on assets (17) (25) (33)
Amortization of:      
Transition obligation 0 0 0
Prior service cost 5 0 4
Actuarial (gain) loss 17 767 0
Curtailment and settlement loss 0 0 0
Defined Benefit Plan, Curtailments 0 356 0
Net periodic benefit cost 156 1,312 259
International Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 48 43 47
Interest cost 44 49 44
Expected return on assets (61) (61) (55)
Amortization of:      
Transition obligation 0 0 0
Prior service cost 1 1 2
Actuarial (gain) loss 31 48 0
Curtailment and settlement loss 0 4 (5)
Defined Benefit Plan, Curtailments 0 0 0
Net periodic benefit cost $ 63 $ 84 $ 33