Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Balance, end of period		$ 3,267	$ 3,381	$ 3,267	$ 3,381
Cash dividends declared per common share		$ 0.335	$ 0.300	$ 0.670	$ 0.600
Common Stock and Paid in Capital [Member]
Balance, beginning of period		$ 134	$ 328	$ 136	$ 328
Compensation expense and common shares issued	[1]	4	4	2	4
Common shares purchased under repurchase program	[2],[3]	(138)	(155)	(138)	(155)
Balance, end of period		0	177	0	177
Retained earnings [Member]
Balance, beginning of period		3,675	2,827	3,653	2,796
Net income		91	786	132	834
Regular dividends		(18)	(17)	(36)	(34)
Common shares purchased under repurchase program	[2]	(15)	0	(15)	0
Other		1	0	0	0
Balance, end of period		3,734	3,596	3,734	3,596
Accumulated other comprehensive income (loss) [Member]
Balance, beginning of period		(491)	(392)	(569)	(372)
Unrealized translation gain (loss)		27	(5)	109	(21)
Unrealized gain (loss) on commodity hedges		(3)	5	(7)	1
Balance, end of period		$ (467)	$ (392)	$ (467)	$ (392)

[1] Common shares issued were 16,937 shares and 13,935 shares for the three months ended March 31, 2023 and 2022, respectively, and 144,514 shares and 108,650 shares for the six months ended March 31, 2023 and 2022, respectively.

[2] Common shares repurchased were 1,488,251 shares for the three and six months ended March 31, 2023, and 2,403,380 shares for the three and six months ended March 31, 2022.

[3] Includes $1 million in excise tax on stock repurchases for the three and six months ended March 31, 2023.