Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans by origination year
Total retained loans	$ 1,280,870	$ 1,089,598	$ 1,010,206
Gross charge-offs by origination year
Total gross charge-offs	7,653	4,326	4,564
Consumer, excluding credit card
Loans by origination year
Total retained loans	397,275	300,753	295,556
Gross charge-offs by origination year
Total gross charge-offs	1,151	812	$ 630
Consumer, excluding credit card | First Republic
Loans by origination year
Total retained loans	90,700
Consumer, excluding credit card | Residential real estate
Loans by origination year
Term loans originated in 2023/2022	23,250	39,964
Term loans originated in 2022/2021	64,450	66,084
Term loans originated in 2021/2020	84,602	43,335
Term loans originated in 2020/2019	55,624	15,427
Term loans originated in 2019/2018	21,592	6,366
Term loans originated prior to 2019/2018	60,820	50,709
Revolving loans within revolving period	7,533	5,608
Revolving loans converted to term loans	8,538	10,068
Total retained loans	$ 326,409	$ 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	0.15%	0.08%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.13%	0.02%
% of 30 plus days past due to total retained loans, Term loans originated in 2021/2020	0.13%	0.05%
% of 30 plus days past due to total retained loans, Term loans originated in 2020/2019	0.14%	0.19%
% of 30 plus days past due to total retained loans, Term loans originated in 2019/2018	0.29%	0.42%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2019/2018	2.04%	2.07%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.72%	0.34%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.53%	3.80%
% of 30 plus days past due to total retained loans	0.63%	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	4
Gross charge-offs originated prior to 2019	167
Gross charge-offs originated within the revolving period	26
Gross charge-offs originated converted to term loans	7
Total gross charge-offs	204
Consumer, excluding credit card | Residential real estate | First Republic
Loans by origination year
Total retained loans	$ 90,700
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	$ 23,216	$ 39,934
Term loans originated in 2022/2021	64,366	66,072
Term loans originated in 2021/2020	84,496	43,315
Term loans originated in 2020/2019	55,546	15,397
Term loans originated in 2019/2018	21,530	6,339
Term loans originated prior to 2019/2018	59,563	49,632
Revolving loans within revolving period	7,479	5,589
Revolving loans converted to term loans	8,151	9,685
Total retained loans	324,347	235,963
Consumer, excluding credit card | Residential real estate | Current | First Republic
Loans by origination year
Term loans originated in 2023/2022	6,400
Term loans originated in 2022/2021	26,300
Term loans originated in 2021/2020	21,900
Term loans originated in 2020/2019	14,800
Term loans originated in 2019/2018	7,400
Term loans originated prior to 2019/2018	10,900
Revolving loans within revolving period	2,500
Consumer, excluding credit card | Residential real estate | 30 or more days past due | First Republic
Loans by origination year
Total retained loans	343
Consumer, excluding credit card | Residential real estate | 30–149 days past due
Loans by origination year
Term loans originated in 2023/2022	33	29
Term loans originated in 2022/2021	74	11
Term loans originated in 2021/2020	89	14
Term loans originated in 2020/2019	70	20
Term loans originated in 2019/2018	41	20
Term loans originated prior to 2019/2018	801	597
Revolving loans within revolving period	49	15
Revolving loans converted to term loans	223	208
Total retained loans	1,380	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	10	1
Term loans originated in 2021/2020	17	6
Term loans originated in 2020/2019	8	10
Term loans originated in 2019/2018	21	7
Term loans originated prior to 2019/2018	456	480
Revolving loans within revolving period	5	4
Revolving loans converted to term loans	164	175
Total retained loans	$ 682	$ 684