AVAILABLE-FOR-SALE SECURITIES, Contractual Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Carrying value
Total	$ 8,547	$ 8,315
RJ Bank
Amortized cost
Within one year	33
After one but within five years	448
After five but within ten years	3,684
After ten years	4,461
Cost basis	8,626	8,322
Carrying value
Within one year	33
After one but within five years	451
After five but within ten years	3,650
After ten years	4,413
Total	$ 8,547	8,315
Weighted-average yield
Within one year (in hundredths)	2.08%
After one but within five years (in hundredths)	1.67%
After five but within ten years (in hundredths)	1.11%
After ten years (in hundredths)	1.08%
Total (in hundredths)	1.13%
RJ Bank | Agency residential MBS
Amortized cost
Within one year	$ 0
After one but within five years	117
After five but within ten years	2,764
After ten years	2,656
Cost basis	5,537	5,168
Carrying value
Within one year	0
After one but within five years	121
After five but within ten years	2,761
After ten years	2,638
Total	5,520	5,189
RJ Bank | Agency commercial MBS
Amortized cost
Within one year	33
After one but within five years	315
After five but within ten years	892
After ten years	84
Cost basis	1,324	1,285
Carrying value
Within one year	33
After one but within five years	313
After five but within ten years	862
After ten years	83
Total	1,291	1,264
RJ Bank | Agency CMOs
Amortized cost
Within one year	0
After one but within five years	6
After five but within ten years	23
After ten years	1,721
Cost basis	1,750	1,854
Carrying value
Within one year	0
After one but within five years	6
After five but within ten years	23
After ten years	1,692
Total	1,721	1,847
RJ Bank | Other securities
Amortized cost
Within one year	0
After one but within five years	10
After five but within ten years	5
After ten years	0
Cost basis	15	15
Carrying value
Within one year	0
After one but within five years	11
After five but within ten years	4
After ten years	0
Total	$ 15	$ 15