Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance, end of period		$ 3,266	$ 3,202	$ 3,266	$ 3,202
Cash dividends declared per common share		$ 0.335	$ 0.300	$ 0.935	$ 0.850
Common Stock and Paid in Capital [Member]
Balance, beginning of period		$ 177	$ 773	$ 328	$ 770
Compensation expense and common shares issued	[1]	1	4	5	7
Common shares purchased under repurchase program	[2]	(45)	0	(200)	0
Balance, end of period		133	777	133	777
Retained earnings [Member]
Balance, beginning of period		3,596	2,710	2,796	2,649
Adoption of new accounting pronouncements		0	0	0	(2)
Net income		36	80	870	176
Regular dividends		(18)	(19)	(52)	(52)
Balance, end of period		3,614	2,771	3,614	2,771
Accumulated other comprehensive income (loss) [Member]
Balance, beginning of period		(392)	(369)	(372)	(383)
Unrealized translation gain (loss)		(86)	23	(107)	37
Unrealized gain on commodity hedges		(3)	0	(2)	0
Balance, end of period		$ (481)	$ (346)	$ (481)	$ (346)

[1] Common shares issued were 55,006 shares and 24,452 shares for the three months ended June 30, 2022 and 2021, respectively, and 163,656 shares and 165,158 shares for the nine months ended June 30, 2022 and 2021, respectively.

[2] Common shares repurchased were 449,932 and 2,853,312 shares for the three and nine months ended June 30, 2022.