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Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassifications from accumulated other comprehensive income (loss)    
Selling, general and administrative expenses $ 395 $ 376
Net of tax 74 53
Actuarial losses, net | Amount Reclassified
    
Reclassifications from accumulated other comprehensive income (loss)    
Selling, general and administrative expenses 3 5
Net of tax $ 3 $ 5