Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Document Fiscal Year Focus 2012    
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year $ 22,837    
Fair value of plan assets at end of year 25,401    
U.S. Pension Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 24,386    
Service cost 998 870 723
Interest cost 1,410 1,309 1,199
Projected benefit obligation at end of year 31,868 24,386  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 22,663    
Fair value of plan assets at end of year 24,941 22,663  
U.S. Postretirement Medical Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 3,836    
Service cost 89 89 86
Interest cost 208 207 214
Projected benefit obligation at end of year 4,412 3,836  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 174    
Fair value of plan assets at end of year 460 174  
International Pension Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 841    
Service cost 41 34 24
Interest cost 41 39 34
Projected benefit obligation at end of year 1,089 841  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 613    
Fair value of plan assets at end of year 801 613  
Benefit Obligations [Member] | U.S. Pension Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 24,386 21,342  
Service cost 998 870  
Interest cost 1,410 1,309  
Gross benefits paid (774) (657)  
Plan participants’ contributions 0 0  
Plan amendments (2) 3  
Actuarial (gain)/loss 5,850 1,519  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Projected benefit obligation at end of year 31,868 24,386  
Fair Value of Plan Assets:      
Plan participants’ contributions 0 0  
Gross benefits paid (774) (657)  
Benefit Obligations [Member] | U.S. Postretirement Medical Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 3,836 3,597  
Service cost 89 89  
Interest cost 208 207  
Gross benefits paid (233) (219)  
Plan participants’ contributions 16 16  
Plan amendments 1 (24)  
Actuarial (gain)/loss 495 170  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Projected benefit obligation at end of year 4,412 3,836  
Fair Value of Plan Assets:      
Plan participants’ contributions 16 16  
Gross benefits paid (233) (219)  
Benefit Obligations [Member] | International Pension Benefits
      
Benefit Obligations:      
Projected benefit obligation at beginning of year 841 680  
Service cost 41 34  
Interest cost 41 39  
Gross benefits paid (20) (15)  
Plan participants’ contributions 4 1  
Plan amendments 0 7  
Actuarial (gain)/loss 112 99  
Foreign currency exchange rate changes 24 (4)  
Curtailments and settlements (5) 0  
Other 51 0  
Projected benefit obligation at end of year 1,089 841  
Fair Value of Plan Assets:      
Plan participants’ contributions 4 1  
Gross benefits paid (20) (15)  
Fair Value of Plan Assets [Member] | U.S. Pension Benefits
      
Benefit Obligations:      
Gross benefits paid (774) (657)  
Plan participants’ contributions 0 0  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 22,663 20,092  
Actual return on plan assets 2,684 1,956  
Employer contributions 368 1,272  
Plan participants’ contributions 0 0  
Gross benefits paid (774) (657)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 0 0  
Fair value of plan assets at end of year 24,941 22,663  
Fair Value of Plan Assets [Member] | U.S. Postretirement Medical Benefits
      
Benefit Obligations:      
Gross benefits paid (233) (219)  
Plan participants’ contributions 16 16  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 174 233  
Actual return on plan assets 19 9  
Employer contributions 475 108  
Plan participants’ contributions 16 16  
Gross benefits paid (233) (219)  
Foreign currency exchange rate changes 0 0  
Curtailments and settlements 0 0  
Other 9 27  
Fair value of plan assets at end of year 460 174  
Fair Value of Plan Assets [Member] | International Pension Benefits
      
Benefit Obligations:      
Gross benefits paid (20) (15)  
Plan participants’ contributions 1 1  
Fair Value of Plan Assets:      
Fair value of plan assets at beginning of year 613 561  
Actual return on plan assets 56 10  
Employer contributions 74 56  
Plan participants’ contributions 1 1  
Gross benefits paid (20) (15)  
Foreign currency exchange rate changes 20 0  
Curtailments and settlements (4) 0  
Other 61 0  
Fair value of plan assets at end of year $ 801 $ 613