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, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Document Fiscal Year Focus 2012  
Funded Status:    
Fair value of plan assets $ 25,401 $ 22,837
U.S. Pension Benefits
   
Funded Status:    
Fair value of plan assets 24,941 22,663
Benefit obligation (31,868) (24,386)
Funded status recognized at December 31 (6,927) (1,723)
Funded Status Amounts Recognized in our Balance Sheet:    
Other non-current assets 0 0
Other current liabilities (14) (13)
Pension and postretirement benefit obligations (6,913) (1,710)
Net liability at December 31 (6,927) (1,723)
Amounts Recognized in AOCI:    
Unrecognized net prior service cost (1,318) (1,492)
Unrecognized net actuarial loss (3,187) (2,439)
Gross unrecognized cost at December 31 (4,505) (3,931)
Deferred tax asset at December 31 1,694 1,479
Net unrecognized cost at December 31 (2,811) (2,452)
U.S. Postretirement Medical Benefits
   
Funded Status:    
Fair value of plan assets 460 174
Benefit obligation (4,412) (3,836)
Funded status recognized at December 31 (3,952) (3,662)
Funded Status Amounts Recognized in our Balance Sheet:    
Other non-current assets 0 0
Other current liabilities (108) (93)
Pension and postretirement benefit obligations (3,844) (3,569)
Net liability at December 31 (3,952) (3,662)
Amounts Recognized in AOCI:    
Unrecognized net prior service cost (79) (82)
Unrecognized net actuarial loss (441) (307)
Gross unrecognized cost at December 31 (520) (389)
Deferred tax asset at December 31 196 146
Net unrecognized cost at December 31 (324) (243)
International Pension Benefits
   
Funded Status:    
Fair value of plan assets 801 613
Benefit obligation (1,089) (841)
Funded status recognized at December 31 (288) (228)
Funded Status Amounts Recognized in our Balance Sheet:    
Other non-current assets 26 1
Other current liabilities (3) (3)
Pension and postretirement benefit obligations (311) (226)
Net liability at December 31 (288) (228)
Amounts Recognized in AOCI:    
Unrecognized net prior service cost (13) (14)
Unrecognized net actuarial loss (86) (52)
Gross unrecognized cost at December 31 (99) (66)
Deferred tax asset at December 31 26 16
Net unrecognized cost at December 31 $ (73) $ (50)