Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of Periodic Benefit Cost (Income) (Details)

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Employee Benefit Plans - Components of Periodic Benefit Cost (Income) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nonqualified and Other Pension Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service Cost $ 3 $ 3 [1] $ 4
Interest Cost 152 163 [1] 167
Expected Return on Plan Assets (141) (138) (148)
Amortization of Transition Obligation 0 0 0
Amortization of Prior Service Cost (Credits) (8) (8) (8)
Amortization Of Net Actuarial Loss (Gain) 16 10 5
Recognized Gain (Loss) Due to Settlements and Curtailments 3 17 2
Net Periodic Benefit Cost 25 47 22
Weighted-Average Assumptions, Discount Rate 5.20% 5.75% 6.00%
Weighted-Average Assumptions, Expected Return on Plan Assets 5.25% 5.25% 5.25%
Weighted-Average Assumptions, Rate of Compensation increase 4.00% 4.00% 4.00%
Postretirement Health and Life Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 15 14 [1] 16
Interest Cost 80 92 [1] 93
Expected Return on Plan Assets (9) (9) (8)
Amortization of Transition Obligation 31 31 31
Amortization of Prior Service Cost (Credits) 4 6 0
Amortization Of Net Actuarial Loss (Gain) (17) (49) (77)
Recognized Gain (Loss) Due to Settlements and Curtailments 0 0 0
Net Periodic Benefit Cost 104 85 55
Weighted-Average Assumptions, Discount Rate 5.10% 5.75% 6.00%
Weighted-Average Assumptions, Expected Return on Plan Assets 8.00% 8.00% 8.00%
Qualified Pension Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 423 397 [1] 387
Interest Cost 746 748 [1] 740
Expected Return on Plan Assets (1,296) (1,263) (1,231)
Amortization of Prior Service Cost (Credits) 20 28 39
Amortization Of Net Actuarial Loss (Gain) 387 362 377
Recognized Gain (Loss) Due to Settlements and Curtailments 0 0 0
Recognized Termination Benefit Costs 0 0 36
Net Periodic Benefit Cost 280 272 348
Weighted-Average Assumptions, Discount Rate 5.45% 5.75% 6.00%
Weighted-Average Assumptions, Expected Return on Plan Assets 8.00% 8.00% 8.00%
Weighted-Average Assumptions, Rate of Compensation increase 4.00% 4.00% 4.00%
Non-U.S. Pension Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Service Cost 43 32 [1] 30
Interest Cost 99 95 [1] 76
Expected Return on Plan Assets (115) (97) (74)
Amortization of Prior Service Cost (Credits) 0 0 0
Amortization Of Net Actuarial Loss (Gain) 0 (1) 0
Recognized Gain (Loss) Due to Settlements and Curtailments 0 0 (2)
Recognized Termination Benefit Costs 0 0 0
Net Periodic Benefit Cost $ 27 $ 29 $ 30
Weighted-Average Assumptions, Discount Rate 5.32% 5.41% 5.55%
Weighted-Average Assumptions, Expected Return on Plan Assets 6.58% 6.60% 6.78%
Weighted-Average Assumptions, Rate of Compensation increase 4.85% 4.67% 4.61%
[1] The measurement date for the Qualified Pension Plans, Non-U.S. Pension Plans, Nonqualified and Other Pension Plans, and Postretirement Health and Life Plans was December 31 of each year reported.