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Retirement Benefits Plans Retirement Benefits Plans - Estimated Future Pretax Amounts Recognized From AOCI to Net Periodic Benefit Cost (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
United States pension liabilities [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans  
Actuarial loss $ 145
Prior service cost (credit) 0
Total 145
Non-United States pension liabilities [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans  
Actuarial loss 15
Prior service cost (credit) 1
Total 16
Other postretirement liabilities [Member]
 
Defined Benefit Plans and Other Postretirement Benefit Plans  
Actuarial loss 15
Prior service cost (credit) (2)
Total $ 13