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, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization of:      
Actuarial (gain) loss $ (569)    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 1,525    
Pension Benefits | U.S. Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 1,543 $ 1,412 $ 1,527
Interest cost 1,813 1,828 1,694
Expected return on assets (2,883) (2,516) (2,489)
Amortization of:      
Amortization of prior service cost 192 166 168
Actuarial (gain) loss 729 2,520 70
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost 1,394 3,410 970
Pension Benefits | International Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 60 49 48
Interest cost 40 41 44
Expected return on assets (66) (58) (61)
Amortization of:      
Amortization of prior service cost 1 1 1
Actuarial (gain) loss 18 114 31
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 2 0 0
Net periodic benefit cost 55 147 63
Postemployment Retirement Benefits | U.S. Pension Benefits      
Net Periodic Benefit Cost:      
Service cost 29 28 34
Interest cost 112 124 117
Expected return on assets (7) (6) (17)
Amortization of:      
Amortization of prior service cost 7 5 5
Actuarial (gain) loss 53 17 17
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 0 0
Net periodic benefit cost $ 194 $ 168 $ 156