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Income Taxes Significant Components of Company's Income Tax Provision from Continuing Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure [Abstract]        
Tax expense at federal statutory rate   $ 863 $ 532 $ 627
State income taxes, net of federal benefit   46 17 (10)
Foreign income tax expense at different rates and foreign losses without tax benefits   (317) (381) (351)
U.S. tax on foreign income   (69) (20) 28
Reserve and valuation allowance adjustments   197 13 (30)
U.S. credits and incentives   (28) (13) (7)
Gain on business divestiture 59 59 0 0
Restructuring and impairment costs   235 81 0
Change in assertion over permanently reinvested earnings 210 210 0 0
Other   (28) (20) 1
Provision for income taxes   $ 1,168 $ 209 $ 258