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Commitments and Contingent Liabilities (Accretion Of Future Funding Obligation) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]    
Total obligation $ 974  
Asbestos litigation reserve current 732 683
Asbestos litigation reserve noncurrent 242 237
Total 98  
Asbestos Issue [Member]
    
Commitments and Contingencies Disclosure [Line Items]    
Remainder of 2012 3  
2013 14  
2014-2023 81  
Total $ 98