Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefit Contributions $ 685 $ 2,668 $ 1,229 $ 1,258
Funded Status:        
Fair value of plan assets 0 0 55  
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefit Contributions     22  
U.S. Pension Benefits        
Funded Status:        
Fair value of plan assets 31,215 31,215 28,887 28,828
Benefit obligation (41,069) (41,069) (36,846) (37,521)
Funded status recognized at December 31 (9,854) (9,854) (7,959)  
Funded Status Recognized in our Balance Sheet:        
Other non-current assets 0 0 0  
Other current liabilities (17) (17) (16)  
Pension and postretirement benefit obligations (9,837) (9,837) (7,943)  
Net liability at December 31 (9,854) (9,854) (7,959)  
Amounts Recognized in AOCI:        
Unrecognized net prior service cost (1,074) (1,074) (954)  
Unrecognized net actuarial gain (loss) (4,107) (4,107) (3,263)  
Gross unrecognized cost at December 31 (5,181) (5,181) (4,217)  
Deferred tax assets (liabilities) at December 31 1,948 1,948 1,585  
Net unrecognized cost at December 31 (3,233) (3,233) (2,632)  
U.S. Postretirement Medical Benefits        
Funded Status:        
Fair value of plan assets 15 15 130 259
Benefit obligation (2,730) (2,730) (2,673) (2,883)
Funded status recognized at December 31 (2,715) (2,715) (2,543)  
Funded Status Recognized in our Balance Sheet:        
Other non-current assets 0 0 0  
Other current liabilities (216) (216) (98)  
Pension and postretirement benefit obligations (2,499) (2,499) (2,445)  
Net liability at December 31 (2,715) (2,715) (2,543)  
Amounts Recognized in AOCI:        
Unrecognized net prior service cost (36) (36) (26)  
Unrecognized net actuarial gain (loss) (80) (80) 32  
Gross unrecognized cost at December 31 (116) (116) 6  
Deferred tax assets (liabilities) at December 31 44 44 (2)  
Net unrecognized cost at December 31 (72) (72) 4  
International Pension Benefits        
Funded Status:        
Fair value of plan assets 1,092 1,092 1,014 1,042
Benefit obligation (1,425) (1,425) (1,219) $ (1,274)
Funded status recognized at December 31 (333) (333) (205)  
Funded Status Recognized in our Balance Sheet:        
Other non-current assets 28 28 48  
Other current liabilities (3) (3) (3)  
Pension and postretirement benefit obligations (358) (358) (250)  
Net liability at December 31 (333) (333) (205)  
Amounts Recognized in AOCI:        
Unrecognized net prior service cost (3) (3) (4)  
Unrecognized net actuarial gain (loss) (150) (150) (103)  
Gross unrecognized cost at December 31 (153) (153) (107)  
Deferred tax assets (liabilities) at December 31 37 37 26  
Net unrecognized cost at December 31 $ (116) $ (116) $ (81)