Shareholders' Equity - Changes in Certain Components of Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Nov. 30, 2021	Sep. 24, 2013
Beginning balance	$ 25,282
Net income	509	$ 677
Ending balance	$ 25,472
Dividends per Common Share (USD per share)	$ 0.91	$ 0.87
Number of shares authorized to be repurchased (in shares)				10,000
Number of additional shares authorized to be repurchased (in shares)			10,000
Common Stock  Issued at Par Value
Beginning balance	$ 365	$ 365
Ending balance	365	365
Capital in Excess of Par Value
Beginning balance	19,553	19,272
Common stock issued for share-based compensation and other plans, net	(52)	(71)
Share-based compensation	89	83
Repurchase of common stock		150
Ending balance	19,590	19,435
Retained Earnings
Beginning balance	15,157	13,826
Net income	509	677
Common dividends	(259)	(248)
Preferred dividends	(23)	(23)
Ending balance	15,384	14,233
Deferred Compensation
Beginning balance	23	23
Ending balance	24	24
Treasury Stock
Beginning balance	$ (8,330)	$ (7,723)
Beginning balance (shares)	(81,283)	(80,164)
Common stock issued for share-based compensation and other plans, net	$ (3)	$ 19
Common stock issued for share-based compensation and other plans, net (in shares)	556	762
Common stock held in trusts, net (in shares)	(11)	(5)
Repurchase of common stock		$ (150)
Repurchase of common stock (in shares)		(462)
Ending balance	$ (8,333)	$ (7,855)
Ending balance (shares)	(80,738)	(79,869)