Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended						6 Months Ended		9 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Jul. 31, 2022	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2023	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Pay vs Performance Disclosure
Net earnings	$ 766	$ 1,054	$ 469	$ 1,122	$ 981	$ 1,052	$ 1,523	$ 2,033	$ 2,289	$ 3,155