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Income, Sales-Based And Other Taxes (Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income, Sales-Based And Other Taxes [Abstract]      
Balance at January 1 $ 4,148 $ 4,725 $ 4,976
Additions based on current year's tax positions 822 830 547
Additions for prior years' tax positions 451 620 262
Reductions for prior years' tax positions (329) (505) (594)
Reductions due to lapse of the statute of limitations   (534)  
Settlements with tax authorities (145) (999) (592)
Foreign exchange effects / other (25) 11 126
Balance at December 31 $ 4,922 $ 4,148 $ 4,725