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Income Taxes (Schedule of Income Tax Provision (Benefit)) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
US $ 78 $ 41 $ 24
International 83 76 32
Total 161 117 56
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]      
US 194 (66) (11)
International 153 (106) (4)
Total 347 (172) (15)
Income tax provision (benefit) $ 508 $ (55) $ 41