Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Quarterly Financial Data [Abstract]
Sales	$ 4,090	$ 3,946	$ 3,756	$ 3,373	$ 3,892	$ 3,465	$ 3,291	$ 3,156	$ 15,165	$ 13,804	$ 12,932
Gross profit	2,012	1,994	1,801	1,620	1,829	1,586	1,476	1,415	7,427	6,306
Earnings from continuing operations common stockholders	701	592	530	329	486	226	428	746	2,152	1,886	1,414
Net income (loss) attributable to shareholders	$ 744	$ 9,352	$ 792	$ 2,331	$ 740	$ 921	$ 674	$ 896	$ 13,219	$ 3,231	$ 2,303
Earnings from continuing operations, basic (in dollars per share)	$ 1.23	$ 1.04	$ 0.93	$ 0.56	$ 0.82	$ 0.38	$ 0.72	$ 1.25	$ 3.74	$ 3.17	$ 2.36
Earnings from continuing operations, diluted (in dollars per share)	1.22	1.03	0.92	0.56	0.82	0.38	0.72	1.25	3.72	3.16	2.35
Basic earnings per common share (in dollars per share)	1.30	16.36	1.39	3.99	1.25	1.55	1.13	1.51	23.00	5.44	3.85
Diluted earnings per common share (in dollars per share)	1.29	16.28	1.38	3.97	1.24	1.54	1.13	1.50	22.88	5.41	3.82
Dividends per common share (in dollars per share)	$ 0.520	$ 0.520	$ 0.520	$ 0.520	$ 0.515	$ 0.515	$ 0.515	$ 0.515	$ 2.08	$ 2.06	$ 2.02