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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Foreign currency transaction and translation gain (loss) before tax $ (13) $ (65) $ (129) $ (48)
Tax (expense) benefit from foreign currency translation gain (loss) (3) 16 22 12
Foreign currency translation adjustments, net-of-tax $ (16) $ (49) $ (107) $ (36)