Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Foreign currency transaction and translation gain (loss) before tax $ (64) $ (48) $ (20)
Tax (expense) benefit from foreign currency translation gain (loss) (8) 21 10
Foreign currency translation adjustments, net-of-tax $ (72) $ (27) $ (10)