Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Loans by origination year
Total retained loans	$ 1,265,941	$ 1,068,073	$ 1,089,598
Gross charge-offs by origination year
Total gross charge-offs	5,096	3,116
Consumer, excluding credit card
Loans by origination year
Total retained loans	397,054	301,403	300,753
Gross charge-offs by origination year
Total gross charge-offs	809	$ 590
Consumer, excluding credit card | First Republic
Loans by origination year
Total retained loans	91,200
Consumer, excluding credit card | Residential real estate
Loans by origination year
Term loans originated in 2023/2022	19,481		39,964
Term loans originated in 2022/2021	64,985		66,084
Term loans originated in 2021/2020	85,557		43,335
Term loans originated in 2020/2019	56,359		15,427
Term loans originated in 2019/2018	21,906		6,366
Term loans originated prior to 2019/2018	62,967		50,709
Revolving loans within the revolving period	7,503		5,608
Revolving loans converted to term loans	8,877		10,068
Total retained loans	$ 327,635		$ 237,561
% of 30+ days past due to total retained loans by origination year
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.02%		0.08%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.06%		0.02%
% of 30 plus days past due to total retained loans, Term loans originated in 2021/2020	0.05%		0.05%
% of 30 plus days past due to total retained loans, Term loans originated in 2020/2019	0.06%		0.19%
% of 30 plus days past due to total retained loans, Term loans originated in 2019/2018	0.24%		0.42%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2019/2018	1.92%		2.07%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.67%		0.34%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.37%		3.80%
% of 30 plus days past due to total retained loans	0.55%		0.66%
Gross charge-offs by origination year
Gross charge-offs originated in 2023	$ 0
Gross charge-offs originated in 2022	0
Gross charge-offs originated in 2021	0
Gross charge-offs originated in 2020	0
Gross charge-offs originated in 2019	1
Gross charge-offs originated prior to 2019	101
Gross charge-offs originated within the revolving period	20
Gross charge-offs originated converted to term loans	7
Total gross charge-offs	129
Consumer, excluding credit card | Residential real estate | First Republic
Loans by origination year
Total retained loans	$ 91,200
Consumer, excluding credit card | Residential real estate | Senior lien
Gross charge-offs by origination year
Percentage of total revolving loans that are senior lien loans	37.00%
Consumer, excluding credit card | Residential real estate | Current
Loans by origination year
Term loans originated in 2023/2022	$ 19,478		$ 39,934
Term loans originated in 2022/2021	64,947		66,072
Term loans originated in 2021/2020	85,516		43,315
Term loans originated in 2020/2019	56,324		15,397
Term loans originated in 2019/2018	21,854		6,339
Term loans originated prior to 2019/2018	61,742		49,632
Revolving loans within the revolving period	7,453		5,589
Revolving loans converted to term loans	8,489		9,685
Total retained loans	325,803		235,963
Consumer, excluding credit card | Residential real estate | Current | First Republic
Loans by origination year
Term loans originated in 2023/2022	6,100
Term loans originated in 2022/2021	26,500
Term loans originated in 2021/2020	22,200
Term loans originated in 2020/2019	15,000
Term loans originated in 2019/2018	7,500
Term loans originated prior to 2019/2018	11,300
Revolving loans within the revolving period	2,500
Consumer, excluding credit card | Residential real estate | 30–149 days past due
Loans by origination year
Term loans originated in 2023/2022	2		29
Term loans originated in 2022/2021	31		11
Term loans originated in 2021/2020	28		14
Term loans originated in 2020/2019	34		20
Term loans originated in 2019/2018	27		20
Term loans originated prior to 2019/2018	759		597
Revolving loans within the revolving period	47		15
Revolving loans converted to term loans	220		208
Total retained loans	1,148		914
Consumer, excluding credit card | Residential real estate | 150 or more days past due
Loans by origination year
Term loans originated in 2023/2022	1		1
Term loans originated in 2022/2021	7		1
Term loans originated in 2021/2020	13		6
Term loans originated in 2020/2019	1		10
Term loans originated in 2019/2018	25		7
Term loans originated prior to 2019/2018	466		480
Revolving loans within the revolving period	3		4
Revolving loans converted to term loans	168		175
Total retained loans	684		$ 684
Consumer, excluding credit card | Residential real estate | 30 or more days past due | First Republic
Loans by origination year
Total retained loans	$ 165