Registration of securities issued in business combination transactions

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

v2.4.0.8
Other Comprehensive Income (Component of Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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 $ (27) $ (10) $ (39)