Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Data [Abstract]
Net sales	$ 3,932	$ 3,674	$ 3,579	$ 3,337	$ 4,204	$ 4,085	$ 3,934	$ 4,026	$ 14,522	$ 16,249	$ 17,733
Gross profit	1,713	1,593	1,542	1,414	1,823	1,759	1,686	1,740	6,262	7,008
Earnings from continuing operations common stockholders	479	441	367	303	627	502	936	452	1,590	2,517	2,201
Net earnings common stockholders	$ 438	$ 479	$ 369	$ 349	$ 648	$ 564	$ 973	$ 525	$ 1,635	$ 2,710	$ 2,147
Basic earnings from continuing operations per common share	$ 0.74	$ 0.68	$ 0.57	$ 0.47	$ 0.95	$ 0.75	$ 1.37	$ 0.65	$ 2.46	$ 3.72	$ 3.13
Diluted earnings from continuing operations per common share	0.74	0.68	0.57	0.46	0.95	0.75	1.36	0.65	2.45	3.71	3.11
Basic earnings per common share	0.68	0.74	0.57	0.54	0.98	0.84	1.42	0.76	2.53	4.01	3.05
Diluted earnings per common share	0.68	0.74	0.57	0.53	0.98	0.84	1.42	0.75	2.52	3.99	3.03
Dividends per common share	0.475	0.475	0.475	0.475	0.47	0.47	0.47	0.47	1.90	1.88	$ 1.72
Common stock prices: High	56.72	56.82	55.54	51.47	56.12	62.75	62.25	65.94	56.82	65.94
Common stock prices: Low	$ 50.41	$ 48.45	$ 41.25	$ 42.21	$ 42.80	$ 55.23	$ 54.95	$ 57.76	$ 41.25	$ 42.80
Effect of Fourth Quarter Events [Line Items]
Gain on divestiture of business, after tax					$ 83				$ 0	$ 611	$ 0
Disposal gain impact on diluted earnings per share					$ 0.13
Power Transmission Solutions [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Quarterly Financial Data [Abstract]
Net sales										189
Effect of Fourth Quarter Events [Line Items]
Gain on divestiture of business, after tax							$ 528			$ 532
Disposal gain impact on diluted earnings per share							$ 0.77			$ 0.78
InterMetro [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Quarterly Financial Data [Abstract]
Net sales										$ 288
Effect of Fourth Quarter Events [Line Items]
Gain on divestiture of business, after tax										$ 79
Disposal gain impact on diluted earnings per share										$ 0.12