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Income Taxes (Unrecognized Tax Benefits, Including Those Attributable To Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Tax Expense (Benefit) [Rollforward]    
Balance at January 1 $ 191 $ 198
Additions based on tax positions related to current year 11 45
Additions for tax positions of prior years 11 38
Reductions for tax positions of prior years (24) (63)
Settlements and agreements (24) (22)
Lapse of statute of limitations (4) (5)
Balance at December 31 $ 161 $ 191