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Reconciliation of Level 3 Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2010
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit
Dec. 31, 2011
Foreign Pension Plans, Defined Benefit
Dec. 31, 2010
Foreign Pension Plans, Defined Benefit
Dec. 31, 2012
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2011
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Dec. 31, 2012
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Hedge Funds
Dec. 31, 2011
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Hedge Funds
Dec. 31, 2012
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Real Estate and Other Securities
Dec. 31, 2011
Fair Value, Inputs, Level 3
United States Pension Plans of US Entity, Defined Benefit
Real Estate and Other Securities
Dec. 31, 2012
Fair Value, Inputs, Level 3
Foreign Pension Plans, Defined Benefit
Dec. 31, 2011
Fair Value, Inputs, Level 3
Foreign Pension Plans, Defined Benefit
Dec. 31, 2012
Fair Value, Inputs, Level 3
Foreign Pension Plans, Defined Benefit
Insurance Contracts
Dec. 31, 2010
Fair Value, Inputs, Level 3
Foreign Pension Plans, Defined Benefit
Insurance Contracts
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]                                    
Fair value at beginning of period $ 1,776 $ 1,540 $ 1,734 $ 1,497 $ 1,456 $ 42 $ 43 $ 120 $ 124 $ 116 $ 73 $ 78 $ 43 $ 20 $ 9 $ 10 $ 10 $ 10
Unrealized gains (losses) relating to: Assets sold during the period                                 (1)  
Unrealized gains (losses) relating to Assets still held at the reporting date                     5 (5) 1 4        
Purchases                         3 19        
Transfers out of Level 3                         (1)          
Fair value at end of period $ 1,776 $ 1,540 $ 1,734 $ 1,497 $ 1,456 $ 42 $ 43 $ 120 $ 124 $ 116 $ 78 $ 73 $ 46 $ 43 $ 9 $ 10 $ 9 $ 10