Retirement Plans Summary of Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Millions, unless otherwise specified															12 Months Ended
	Sep. 30, 2013 U.S. Pension Plans	Sep. 30, 2012 U.S. Pension Plans	Sep. 30, 2011 U.S. Pension Plans	Sep. 30, 2013 U.S. Pension Plans Hedge Funds	Sep. 30, 2012 U.S. Pension Plans Hedge Funds	Sep. 30, 2013 U.S. Pension Plans Real Estate	Sep. 30, 2012 U.S. Pension Plans Real Estate	Sep. 30, 2013 Non-U.S. Pension	Sep. 30, 2012 Non-U.S. Pension	Sep. 30, 2011 Non-U.S. Pension	Sep. 30, 2013 Non-U.S. Pension Hedge Funds	Sep. 30, 2012 Non-U.S. Pension Hedge Funds	Sep. 30, 2013 Non-U.S. Pension Real Estate	Sep. 30, 2012 Non-U.S. Pension Real Estate	Sep. 30, 2013 Fair Value, Inputs, Level 3 U.S. Pension Plans	Sep. 30, 2012 Fair Value, Inputs, Level 3 U.S. Pension Plans	Sep. 30, 2013 Fair Value, Inputs, Level 3 U.S. Pension Plans Hedge Funds	Sep. 30, 2012 Fair Value, Inputs, Level 3 U.S. Pension Plans Hedge Funds	Sep. 30, 2013 Fair Value, Inputs, Level 3 U.S. Pension Plans Real Estate	Sep. 30, 2012 Fair Value, Inputs, Level 3 U.S. Pension Plans Real Estate	Sep. 30, 2013 Fair Value, Inputs, Level 3 Non-U.S. Pension	Sep. 30, 2012 Fair Value, Inputs, Level 3 Non-U.S. Pension	Sep. 30, 2013 Fair Value, Inputs, Level 3 Non-U.S. Pension Hedge Funds	Sep. 30, 2012 Fair Value, Inputs, Level 3 Non-U.S. Pension Hedge Funds	Sep. 30, 2013 Fair Value, Inputs, Level 3 Non-U.S. Pension Real Estate	Sep. 30, 2012 Fair Value, Inputs, Level 3 Non-U.S. Pension Real Estate
Retirement Plans [Line Items]
Fair value of plan assets at beginning of year	$ 2,656	$ 2,985	$ 2,372	$ 17	$ 94	$ 285	$ 240	$ 1,656	$ 1,657	$ 1,471	$ 89	$ 56	$ 90	$ 91	$ 334	$ 298	$ 94	$ 94	$ 240	$ 204	$ 64	$ 7	$ 56	$ 0	$ 8	$ 7
Additions net of redemptions															(74)	11	(80)	0	6	11	31	48	31	48	0	0
Realized gain															32		13		19
Unrealized gain (loss)															10	25	(10)	0	20	25	3	9	2	8	1	1
Fair value of plan assets at end of year	$ 2,656	$ 2,985	$ 2,372	$ 17	$ 94	$ 285	$ 240	$ 1,656	$ 1,657	$ 1,471	$ 89	$ 56	$ 90	$ 91	$ 302	$ 334	$ 17	$ 94	$ 285	$ 240	$ 98	$ 64	$ 89	$ 56	$ 9	$ 8