AVAILABLE-FOR-SALE SECURITIES, Contractual Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Carrying value
Total	$ 8,815	$ 8,315
RJ Bank
Amortized cost
Within one year	26
After one but within five years	1,088
After five but within ten years	3,676
After ten years	4,537
Cost basis	9,327	8,322
Carrying value
Within one year	26
After one but within five years	1,060
After five but within ten years	3,469
After ten years	4,260
Total	$ 8,815	8,315
Weighted-average yield
Within one year (in hundredths)	2.23%
After one but within five years (in hundredths)	1.67%
After five but within ten years (in hundredths)	1.18%
After ten years (in hundredths)	1.30%
Total (in hundredths)	1.30%
RJ Bank | Agency residential MBS
Amortized cost
Within one year	$ 0
After one but within five years	130
After five but within ten years	2,746
After ten years	2,753
Cost basis	5,629	5,168
Carrying value
Within one year	0
After one but within five years	130
After five but within ten years	2,628
After ten years	2,599
Total	5,357	5,189
RJ Bank | Agency commercial MBS
Amortized cost
Within one year	26
After one but within five years	427
After five but within ten years	888
After ten years	73
Cost basis	1,414	1,285
Carrying value
Within one year	26
After one but within five years	406
After five but within ten years	800
After ten years	68
Total	1,300	1,264
RJ Bank | Agency CMOs
Amortized cost
Within one year	0
After one but within five years	7
After five but within ten years	39
After ten years	1,711
Cost basis	1,757	1,854
Carrying value
Within one year	0
After one but within five years	7
After five but within ten years	38
After ten years	1,593
Total	1,638	1,847
RJ Bank | U.S. Treasuries
Amortized cost
Within one year	0
After one but within five years	211
After five but within ten years	3
After ten years	0
Cost basis	214	15
Carrying value
Within one year	0
After one but within five years	210
After five but within ten years	3
After ten years	0
Total	213	$ 15
RJ Bank | Other agency obligations
Amortized cost
Within one year	0
After one but within five years	313
After five but within ten years	0
After ten years	0
Cost basis	313
Carrying value
Within one year	0
After one but within five years	307
After five but within ten years	0
After ten years	0
Total	$ 307