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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated variable interest entities, tax     $ 23
Deconsolidated variable interest entities, tax     2
Share-based compensation, tax $ 7 $ 4 $ 3