Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Component of Other Comprehensive Income) (Details)

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Other Comprehensive Income (Component of Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Foreign currency transaction and translation gain (loss) before tax $ (116) $ 17
Tax (expense) benefit from foreign currency translation gain (loss) 25 (4)
Foreign currency translation adjustments, net-of-tax $ (91) $ 13