Income Taxes (Details) (USD $)	3 Months Ended							12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Examination [Line Items]
Adjustment to opening balance of retained earnings							$ 112,000,000
Tax effect on adjustment to opening balance of retained earnings							73,000,000
Valuation allowance adjustment recorded as income tax expense	145,000,000		94,000,000	35,000,000		(30,000,000)			47,000,000
Gross tax effected unrecognized tax benefits	1,345,000,000			1,465,000,000		1,357,000,000	1,262,000,000	1,345,000,000	1,465,000,000	1,357,000,000
Amount of unrecognized tax benefits which may impact effective tax rate	1,198,000,000			1,274,000,000		1,164,000,000		1,198,000,000	1,274,000,000	1,164,000,000
Total net accrued interest, net of tax benefit	84,000,000			72,000,000		77,000,000		84,000,000	72,000,000	77,000,000
Number of months estimated for conclusion period for tax examinations, appellate proceedings and/or tax litigation								12 months
Audit resolutions								(28,000,000)	(20,000,000)	1,000,000
Uncertain tax position adjustments		79,000,000	17,000,000		(22,000,000)
Interest and penalties included in change in uncertain tax positions					(13,000,000)
Gain on business divestiture	59,000,000							59,000,000	0	0
Change in assertion over permanently reinvested earnings	210,000,000							210,000,000	0	0
Restructuring and impairment costs								235,000,000	81,000,000	0
Consolidated domestic income from continuing operations before income taxes and noncontrolling interests								2,335,000,000	1,061,000,000	1,013,000,000
Consolidated non-U.S. income from continuing operations before income taxes and noncontrolling interests								130,000,000	459,000,000	777,000,000
Income taxes paid								531,000,000	496,000,000	384,000,000
Undistributed earnings of consolidated foreign subsidiaries on which domestic income taxes have not been provided	7,600,000,000							7,600,000,000
Net operating loss, carryforwards	5,000,000,000							5,000,000,000
Net operating loss carryforwards that will expire	2,100,000,000							2,100,000,000
U.S foreign tax credit, carryforwards	900,000,000							900,000,000
Minimum
Income Tax Examination [Line Items]
Expiration period of net operating loss carryforwards								Jan. 01, 2014
Expiration period of U.S foreign tax credit carryforwards								2016
Maximum
Income Tax Examination [Line Items]
Expiration period of net operating loss carryforwards								Dec. 31, 2032
Expiration period of U.S foreign tax credit carryforwards								2022
Mexico
Income Tax Examination [Line Items]
Audit resolutions		$ 61,000,000
Japan
Income Tax Examination [Line Items]
Percentage of reduction in tax rate									5.00%