Revised Consolidated Statements of Earnings - Revised Consolidated Condensed Statements of Comprehensive Income (Loss) (Details) - 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
Revised Consolidated Statements of Comprehensive Income (Loss) [Line Items]
Net earnings	$ 766	$ 1,054	$ 469	$ 1,122	$ 981	$ 1,052	$ 1,523	$ 2,033	$ 2,289	$ 3,155
Gains arising during the period	0	6	(1)	10	1	1	5	2	5	12
Other comprehensive income (loss) before taxes	11	110	(924)	(48)	453	250	(814)	703	(803)	655
Benefit from (provision for) taxes	3	(22)	183	(62)	(90)	(20)	161	(110)	164	(172)
Other comprehensive income (loss), net of taxes	14	88	(741)	(110)	363	230	(653)	593	(639)	483
Comprehensive income	$ 780	1,142	(272)	1,012	1,344	1,282	870	2,626	$ 1,650	3,638
As reported
Revised Consolidated Statements of Comprehensive Income (Loss) [Line Items]
Net earnings		1,066	487	1,119	1,000	1,086	1,553	2,086		3,205
Gains arising during the period		6	(38)	10	1	21	(32)	22		32
Other comprehensive income (loss) before taxes		110	(961)	(48)	453	270	(851)	723		675
Benefit from (provision for) taxes		(22)	192	(62)	(90)	(26)	170	(116)		(178)
Other comprehensive income (loss), net of taxes		88	(769)	(110)	363	244	(681)	607		497
Comprehensive income		1,154	(282)	1,009	1,363	1,330	872	2,693		3,702
Adjustment
Revised Consolidated Statements of Comprehensive Income (Loss) [Line Items]
Net earnings		(12)	(18)	3	(19)	(34)	(30)	(53)		(50)
Gains arising during the period		0	37	0	0	(20)	37	(20)		(20)
Other comprehensive income (loss) before taxes		0	37	0	0	(20)	37	(20)		(20)
Benefit from (provision for) taxes		0	(9)	0	0	6	(9)	6		6
Other comprehensive income (loss), net of taxes		0	28	0	0	(14)	28	(14)		(14)
Comprehensive income		$ (12)	$ 10	$ 3	$ (19)	$ (48)	$ (2)	$ (67)		$ (64)