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Pension and Postretirement Benefit Plans (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Amounts recognized in the Consolidated Balance Sheet      
Non-current assets $ 40 $ 74  
Accrued benefit cost      
Current liabilities (53) (41)  
Non-current liabilities (3,972) (2,013)  
Qualified and Non-qualified Pension Benefits
     
Change in plan assets      
Company contributions 517 556 1,259
United States Qualified and Non-qualified Pension Benefits
     
Change in benefit obligation      
Benefit obligation at beginning of year 12,319 11,391  
Service cost 206 201 183
Interest cost 626 638 619
Plan amendments 8    
Actuarial (gain) loss 2,022 760  
Benefit payments (680) (668)  
Settlements, curtailments, special termination benefits and other (2) (3)  
Benefit obligation at end of year 14,499 12,319 11,391
Change in plan assets      
Fair value, beginning balance 11,575 10,493  
Actual return on plan assets 972 1,463  
Company contributions 237 290  
Benefit payments (680) (668)  
Settlements, curtailments, special termination benefits and other (2) (3)  
Fair value, ending balance 12,102 11,575 10,493
Funded status at end of year (2,397) (744)  
Accrued benefit cost      
Current liabilities (41) (30)  
Non-current liabilities (2,356) (714)  
Ending balance (2,397) (744)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss (gain) 5,623 3,981  
Prior service cost (credit) 30 33  
Ending balance 5,653 4,014  
Accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 14,499 443  
Accumulated benefit obligation 13,804 441  
Fair value of plan assets 12,102 25  
Total Accumulated Benefit Obligation 13,804 11,754  
International Qualified and Non-qualified Pension Benefits
     
Change in benefit obligation      
Benefit obligation at beginning of year 4,912 4,685  
Acquisitions 48 4  
Service cost 124 105 98
Interest cost 261 241 235
Participant contributions 5 4  
Foreign exchange rate changes (84) 16  
Plan amendments (31) (75)  
Actuarial (gain) loss 318 167  
Benefit payments (221) (194)  
Settlements, curtailments, special termination benefits and other   (41)  
Benefit obligation at end of year 5,332 4,912 4,685
Change in plan assets      
Fair value, beginning balance 4,355 3,897  
Acquisitions 26 4  
Actual return on plan assets 272 360  
Company contributions 280 266  
Participant contributions 5 4  
Foreign exchange rate changes (74) 18  
Benefit payments (221) (194)  
Fair value, ending balance 4,643 4,355 3,897
Funded status at end of year (689) (557)  
Amounts recognized in the Consolidated Balance Sheet      
Non-current assets 40 74  
Accrued benefit cost      
Current liabilities (8) (7)  
Non-current liabilities (721) (624)  
Ending balance (689) (557)  
Amounts recognized in accumulated other comprehensive income      
Net transition obligation (asset) (8) (7)  
Net actuarial loss (gain) 1,858 1,670  
Prior service cost (credit) (167) (144)  
Ending balance 1,683 1,519  
Accumulated benefit obligations in excess of plan assets      
Projected benefit obligation 2,983 1,676  
Accumulated benefit obligation 2,740 1,563  
Fair value of plan assets 2,321 1,122  
Total Accumulated Benefit Obligation 4,889 4,532  
Postretirement Benefits
     
Change in benefit obligation      
Benefit obligation at beginning of year 1,828 1,579  
Service cost 61 55 51
Interest cost 92 88 97
Participant contributions 56 59  
Foreign exchange rate changes (9) 6  
Plan amendments   69  
Actuarial (gain) loss 228 125  
Medicare Part D Reimbursement 7 13  
Benefit payments (155) (166)  
Benefit obligation at end of year 2,108 1,828 1,579
Change in plan assets      
Fair value, beginning balance 1,149 1,075  
Actual return on plan assets 94 119  
Company contributions 65 62 133
Participant contributions 56 59  
Benefit payments (155) (166)  
Fair value, ending balance 1,209 1,149 1,075
Funded status at end of year (899) (679)  
Accrued benefit cost      
Current liabilities (4) (4)  
Non-current liabilities (895) (675)  
Ending balance (899) (679)  
Amounts recognized in accumulated other comprehensive income      
Net actuarial loss (gain) 1,171 1,063  
Prior service cost (credit) (269) (341)  
Ending balance $ 902 $ 722