Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Amount Amortized from Accumulated OCI (Details)

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Employee Benefit Plans - Amount Amortized from Accumulated OCI (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]  
Net Actuarial (Gain) Loss $ 581
Prior Service Cost (Credit) 15
Transition Obligation 31
Total Amortized from Accumulated OCI 627
Qualified Pension Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net Actuarial (Gain) Loss 598 [1]
Prior Service Cost (Credit) 18 [1]
Transition Obligation 0 [1]
Total Amortized from Accumulated OCI 616 [1]
Nonqualified and Other Pension Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net Actuarial (Gain) Loss 10
Prior Service Cost (Credit) (7)
Transition Obligation 0
Total Amortized from Accumulated OCI 3
Postretirement Health and Life Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net Actuarial (Gain) Loss (19)
Prior Service Cost (Credit) 4
Transition Obligation 31
Total Amortized from Accumulated OCI 16
Non-U.S. Pension Plans [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Net Actuarial (Gain) Loss (8)
Prior Service Cost (Credit) 0
Transition Obligation 0
Total Amortized from Accumulated OCI $ (8)
[1] Estimates are subject to change based on final calculations related to the pension plan freeze discussed on page 241.