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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefit Contributions $ 1,229 $ 1,258 $ 212
Document Fiscal Year Focus 2015    
Funded Status:      
Fair value of plan assets $ 30,031 30,129  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefit Contributions 22 19  
U.S. Pension Benefits      
Funded Status:      
Fair value of plan assets 28,887 28,828  
Benefit obligation (36,846) (37,521)  
Funded status recognized at December 31 (7,959) (8,693)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (16) (17)  
Pension and postretirement benefit obligations (7,943) (8,676)  
Net liability at December 31 (7,959) (8,693)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (954) (1,122)  
Unrecognized net actuarial gain (loss) (3,263) (3,752)  
Gross unrecognized cost at December 31 (4,217) (4,874)  
Deferred tax assets (liabilities) at December 31 1,585 1,833  
Net unrecognized cost at December 31 (2,632) (3,041)  
U.S. Postretirement Medical Benefits      
Funded Status:      
Fair value of plan assets 130 259  
Benefit obligation (2,673) (2,883)  
Funded status recognized at December 31 (2,543) (2,624)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (98) (102)  
Pension and postretirement benefit obligations (2,445) (2,522)  
Net liability at December 31 (2,543) (2,624)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (26) (32)  
Unrecognized net actuarial gain (loss) 32 (89)  
Gross unrecognized cost at December 31 6 (121)  
Deferred tax assets (liabilities) at December 31 (2) 45  
Net unrecognized cost at December 31 4 (76)  
International Pension Benefits      
Funded Status:      
Fair value of plan assets 1,014 1,042  
Benefit obligation (1,219) (1,274)  
Funded status recognized at December 31 (205) (232)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 48 25  
Other current liabilities (3) (3)  
Pension and postretirement benefit obligations (250) (254)  
Net liability at December 31 (205) (232)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (4) (7)  
Unrecognized net actuarial gain (loss) (103) (103)  
Gross unrecognized cost at December 31 (107) (110)  
Deferred tax assets (liabilities) at December 31 26 29  
Net unrecognized cost at December 31 $ (81) $ (81)