Annual report pursuant to Section 13 and 15(d)

Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet (Detail)

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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
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Funded Status:      
Fair value of plan assets $ 22,837 $ 20,325  
U.S. Pension Benefits
     
Funded Status:      
Fair value of plan assets 22,663 20,092 15,351
Benefit obligation (24,386) (21,342) (17,763)
Funded status recognized at December 31 (1,723) (1,250)  
Funded Status Amounts Recognized in our Balance Sheet:      
Other non-current assets   42  
Other current liabilities (13) (11)  
Pension and postretirement benefit obligations (1,710) (1,281)  
Net liability at December 31 (1,723) (1,250)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (1,492) (1,660)  
Unrecognized net actuarial loss (2,439) (1,777)  
Gross unrecognized cost at December 31 (3,931) (3,437)  
Deferred tax asset at December 31 1,479 1,292  
Net unrecognized cost at December 31 (2,452) (2,145)  
U.S. Postretirement Medical Benefits
     
Funded Status:      
Fair value of plan assets 174 233 298
Benefit obligation (3,836) (3,597) (3,336)
Funded status recognized at December 31 (3,662) (3,364)  
Funded Status Amounts Recognized in our Balance Sheet:      
Other current liabilities (93) (99)  
Pension and postretirement benefit obligations (3,569) (3,265)  
Net liability at December 31 (3,662) (3,364)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (82) (113)  
Unrecognized net actuarial loss (307) (157)  
Gross unrecognized cost at December 31 (389) (270)  
Deferred tax asset at December 31 146 102  
Net unrecognized cost at December 31 (243) (168)  
International Pension Benefits
     
Funded Status:      
Fair value of plan assets 613 561 481
Benefit obligation (841) (680) (575)
Funded status recognized at December 31 (228) (119)  
Funded Status Amounts Recognized in our Balance Sheet:      
Other non-current assets 1 1  
Other current liabilities (3) (3)  
Pension and postretirement benefit obligations (226) (117)  
Net liability at December 31 (228) (119)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (14) (8)  
Unrecognized net actuarial loss (52) (22)  
Gross unrecognized cost at December 31 (66) (30)  
Deferred tax asset at December 31 16 3  
Net unrecognized cost at December 31 $ (50) $ (27)