Allowance for Credit Losses - Summary (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for loan losses
Beginning balance	$ 19,726	$ 16,386
Gross charge-offs	5,096	3,116
Gross recoveries collected	(1,051)	(1,150)
Net charge-offs/(recoveries)	4,045	1,966
Provision for loan losses	6,843	3,763
Other	9	2
Ending balance	21,946	18,185
Allowance for lending-related commitments
Beginning balance	2,382	2,261
Provision for lending-related commitments	(308)	289
Other	1	1
Ending balance	2,075	2,551
Total allowance for investment securities	117	61	$ 96
Total allowance for credit losses	24,138	20,797
Allowance for loan losses by impairment methodology
Asset-specific	(210)	(34)
Portfolio-based	22,156	18,219
Total allowance for loan losses	21,946	18,185	19,726
Loans by impairment methodology
Asset-specific	5,723	15,294
Portfolio-based	1,260,218	1,052,779
Total retained loans	1,265,941	1,068,073	1,089,598
Allowance for lending-related commitments by impairment methodology
Asset-specific	61	84
Portfolio-based	2,014	2,467
Total allowance for lending-related commitments	2,075	2,551	2,382
Lending-related commitments by impairment methodology
Asset-specific	387	470
Portfolio-based	545,182	474,789
Total lending-related commitments	545,569	475,259
First Republic
Allowance for lending-related commitments
Total allowance for credit losses	1,200
Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02
Allowance for loan losses
Beginning balance	(587)
Allowance for loan losses by impairment methodology
Total allowance for loan losses			(587)
CIB
Lending-related commitments by impairment methodology
Allowance for credit losses associated with accounts receivable	17	30
Collateral-dependent loans
Allowance for loan losses
Net charge-offs/(recoveries)	131	(16)
Collateral-dependent loans
Loans measured at fair value of collateral less cost to sell	4,458	4,255
Consumer, excluding credit card
Allowance for loan losses
Beginning balance	2,040	1,765
Gross charge-offs	809	590
Gross recoveries collected	(388)	(441)
Net charge-offs/(recoveries)	421	149
Provision for loan losses	723	202
Other	1	1
Ending balance	1,854	1,819
Allowance for lending-related commitments
Beginning balance	76	113
Provision for lending-related commitments	5	(36)
Other	0	0
Ending balance	81	77
Total allowance for credit losses	1,935	1,896
Allowance for loan losses by impairment methodology
Asset-specific	(942)	(702)
Portfolio-based	2,796	2,521
Total allowance for loan losses	1,854	1,819	2,040
Loans by impairment methodology
Asset-specific	3,321	12,218
Portfolio-based	393,733	289,185
Total retained loans	397,054	301,403	300,753
Allowance for lending-related commitments by impairment methodology
Asset-specific	0	0
Portfolio-based	81	77
Total allowance for lending-related commitments	81	77	76
Lending-related commitments by impairment methodology
Asset-specific	0	0
Portfolio-based	30,245	22,259
Total lending-related commitments	30,245	22,259
Credit card lending-related commitments not permitted to have an allowance for credit losses	18,100	12,600
Consumer, excluding credit card | First Republic
Loans by impairment methodology
Total retained loans	91,200
Consumer, excluding credit card | Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02
Allowance for loan losses
Beginning balance	(489)
Allowance for loan losses by impairment methodology
Total allowance for loan losses			(489)
Consumer, excluding credit card | Collateral-dependent loans
Allowance for loan losses
Net charge-offs/(recoveries)	4	(29)
Collateral-dependent loans
Loans measured at fair value of collateral less cost to sell	3,384	3,718
Credit card
Allowance for loan losses
Beginning balance	11,200	10,250
Gross charge-offs	3,852	2,294
Gross recoveries collected	(579)	(616)
Net charge-offs/(recoveries)	3,273	1,678
Provision for loan losses	4,073	1,828
Other	0	0
Ending balance	11,900	10,400
Allowance for lending-related commitments
Beginning balance	0	0
Provision for lending-related commitments	0	0
Other	0	0
Ending balance	0	0
Total allowance for credit losses	11,900	10,400
Allowance for loan losses by impairment methodology
Asset-specific	0	218
Portfolio-based	11,900	10,182
Total allowance for loan losses	11,900	10,400	11,200
Loans by impairment methodology
Asset-specific	0	794
Portfolio-based	196,935	169,668
Total retained loans	196,935	170,462
Allowance for lending-related commitments by impairment methodology
Asset-specific	0	0
Portfolio-based	0	0
Total allowance for lending-related commitments	0	0	0
Lending-related commitments by impairment methodology
Asset-specific	0	0
Portfolio-based	0	0
Total lending-related commitments	0	0
Credit card lending-related commitments not permitted to have an allowance for credit losses	898,900	798,900
Credit card | Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02
Allowance for loan losses
Beginning balance	(100)
Allowance for loan losses by impairment methodology
Total allowance for loan losses			(100)
Credit card | Collateral-dependent loans
Allowance for loan losses
Net charge-offs/(recoveries)	0	0
Collateral-dependent loans
Loans measured at fair value of collateral less cost to sell	0	0
Wholesale
Allowance for loan losses
Beginning balance	6,486	4,371
Gross charge-offs	435	232
Gross recoveries collected	(84)	(93)
Net charge-offs/(recoveries)	351	139
Provision for loan losses	2,047	1,733
Other	8	1
Ending balance	8,192	5,966
Allowance for lending-related commitments
Beginning balance	2,306	2,148
Provision for lending-related commitments	(313)	325
Other	1	1
Ending balance	1,994	2,474
Total allowance for credit losses	10,186	8,440
Allowance for loan losses by impairment methodology
Asset-specific	732	450
Portfolio-based	7,460	5,516
Total allowance for loan losses	8,192	5,966	6,486
Loans by impairment methodology
Asset-specific	2,402	2,282
Portfolio-based	669,550	593,926
Total retained loans	671,952	596,208	603,670
Allowance for lending-related commitments by impairment methodology
Asset-specific	61	84
Portfolio-based	1,933	2,390
Total allowance for lending-related commitments	1,994	2,474	2,306
Lending-related commitments by impairment methodology
Asset-specific	387	470
Portfolio-based	514,937	452,530
Total lending-related commitments	515,324	453,000
Credit card lending-related commitments not permitted to have an allowance for credit losses	16,200	20,000
Wholesale | First Republic
Loans by impairment methodology
Total retained loans	53,800
Wholesale | Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02
Allowance for loan losses
Beginning balance	2
Allowance for loan losses by impairment methodology
Total allowance for loan losses			$ 2
Wholesale | Collateral-dependent loans
Allowance for loan losses
Net charge-offs/(recoveries)	127	13
Collateral-dependent loans
Loans measured at fair value of collateral less cost to sell	$ 1,074	$ 537