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Pension and Postretirement Benefit Plans (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Maximum
      
Net periodic benefit cost (benefit)      
Defined benefit plan estimated future employer contributions $ 1,000    
Minimum
      
Net periodic benefit cost (benefit)      
Defined benefit plan estimated future employer contributions 800    
Qualified and Non-qualified Pension Benefits
      
Net periodic benefit cost (benefit)      
Contributions made to the Company's plans 517 556  
United States Qualified and Non-qualified Pension Benefits
      
Net periodic benefit cost (benefit)      
Service cost 206 201 183
Interest cost 626 638 619
Expected return on plan assets (927) (929) (906)
Amortization of prior service cost (benefit) 11 13 16
Amortization of net actuarial (gain) loss 334 221 99
Net periodic benefit cost (benefit) 250 144 11
Settlements, curtailments, special termination benefits and other 1   26
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other 251 144 37
Amounts expected to be amortized from accumulated other comprehensive income into net periodic benefit costs over next fiscal year      
Amortization of prior service cost (benefit) 6    
Amortization of net actuarial (gain) loss 470    
Total amortization expected over the next fiscal year 476    
Weighted-average assumptions used to determine net cost for years ended      
Discount rate 5.23% 5.77% 6.14%
Expected return on assets 8.50% 8.50% 8.50%
Percentage decrease in expected return on assets in next fiscal year from the prior year 0.25%    
Compensation rate increase 4.00% 4.30% 4.30%
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.15% 5.23% 5.77%
Compensation rate increase 4.00% 4.00% 4.30%
Percentage decrease in discount rate obligation from the prior year 1.08%    
Additional expected pension expense in next fiscal year from the prior year 30    
Company's assumption for the expected return on plan assets      
Expected rate of return on plan assets in next fiscal year 8.25%    
Amount of company's common stock contributed by company     600
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Prior service cost (benefit) 8    
Amortization of prior service cost (benefit) (11) (13) (16)
Net actuarial (gain) loss 1,976 227 585
Amortization of net actuarial (gain) loss (334) (221) (99)
Total recognized in other comprehensive (income) loss 1,639 (7) 470
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss 1,890 137 507
United States Qualified Pension Benefits
      
Asset Allocation assumption next fiscal year      
Global equities assumption next fiscal year 37.00%    
Private equities assumption next fiscal year 16.00%    
Fixed-income securities assumption next fiscal year 26.00%    
Absolute return investments assumption next fiscal year 16.00%    
Commodities assumption next fiscal year 5.00%    
Company's assumption for the expected return on plan assets      
Global equities assumption next fiscal year 7.75%    
Private equities assumption next fiscal year 11.75%    
Fixed-income securities assumption next fiscal year 4.23%    
Absolute return investments assumption next fiscal year 6.00%    
Commodities assumption next fiscal year 6.00%    
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Rate of return on plan assets 8.70% 14.40% 12.60%
Average annual actual return on plan assets over the past 10 years 8.10%    
Average annual actual return on plan assets over the past 25 years 10.40%    
International Qualified and Non-qualified Pension Benefits
      
Net periodic benefit cost (benefit)      
Service cost 124 105 98
Interest cost 261 241 235
Expected return on plan assets (289) (278) (260)
Amortization of transition (asset) obligation (2) 1 3
Amortization of prior service cost (benefit) (14) (4) (4)
Amortization of net actuarial (gain) loss 116 84 42
Net periodic benefit cost (benefit) 196 149 114
Settlements, curtailments, special termination benefits and other 2 (22) 25
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other 198 127 139
Amounts expected to be amortized from accumulated other comprehensive income into net periodic benefit costs over next fiscal year      
Amortization of transition (asset) obligation (2)    
Amortization of prior service cost (benefit) (17)    
Amortization of net actuarial (gain) loss 120    
Total amortization expected over the next fiscal year 101    
Weighted-average assumptions used to determine net cost for years ended      
Discount rate 5.04% 5.30% 5.53%
Expected return on assets 6.58% 6.90% 6.86%
Compensation rate increase 3.59% 3.72% 3.50%
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.58% 5.04% 5.30%
Compensation rate increase 3.52% 3.59% 3.72%
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Transition (asset) obligation (2) (1) (2)
Amortization of transition (asset) obligation 2 (1) (3)
Prior service cost (benefit) (32) (91) 19
Amortization of prior service cost (benefit) 14 4 4
Net actuarial (gain) loss 315 104 224
Amortization of net actuarial (gain) loss (116) (84) (42)
Foreign currency (17) (19) (101)
Total recognized in other comprehensive (income) loss 164 (88) 99
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss 362 39 238
Postretirement Benefits
      
Net periodic benefit cost (benefit)      
Service cost 61 55 51
Interest cost 92 88 97
Expected return on plan assets (77) (83) (86)
Amortization of prior service cost (benefit) (72) (94) (81)
Amortization of net actuarial (gain) loss 102 85 66
Net periodic benefit cost (benefit) 106 51 47
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other 106 51 47
Contributions made to the Company's plans 65 62  
Amounts expected to be amortized from accumulated other comprehensive income into net periodic benefit costs over next fiscal year      
Amortization of prior service cost (benefit) (72)    
Amortization of net actuarial (gain) loss 109    
Total amortization expected over the next fiscal year 37    
Weighted-average assumptions used to determine net cost for years ended      
Discount rate 5.09% 5.62% 6.14%
Expected return on assets 7.38% 7.30% 7.24%
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.04% 5.09% 5.62%
Percentage decrease in discount rate obligation from the prior year 1.05%    
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss      
Prior service cost (benefit)   69 (169)
Amortization of prior service cost (benefit) 72 94 81
Net actuarial (gain) loss 212 89 36
Amortization of net actuarial (gain) loss (102) (85) (66)
Foreign currency (2) (1) (1)
Total recognized in other comprehensive (income) loss 180 166 (119)
Total recognized in net periodic benefit cost (benefit) and other comprehensive (income) loss $ 286 $ 217 $ (72)