Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Loans by origination year
Total retained loans	$ 1,285,370	$ 1,265,941	$ 1,280,870
Gross charge-offs by origination year
Total gross charge-offs	7,674	5,096
Consumer, excluding credit card
Loans by origination year
Total retained loans	377,938	397,054	397,275
Gross charge-offs by origination year
Total gross charge-offs	971	$ 809
Consumer, excluding credit card \| Residential real estate
Loans by origination year
Term loans originated in 2024/2023	8,332		23,250
Term loans originated in 2023/2022	18,030		64,450
Term loans originated in 2022/2021	62,304		84,602
Term loans originated in 2021/2020	81,073		55,624
Term loans originated in 2020/2019	53,121		21,592
Term loans originated prior to 2020/2019	73,960		60,820
Revolving loans within the revolving period	6,843		7,533
Revolving loans converted to term loans	7,675		8,538
Total retained loans	$ 311,338		$ 326,409
% 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 2024/2023	0.02%		0.15%
% of 30 plus days past due to total retained loans, Term loans originated in 2023/2022	0.13%		0.13%
% of 30 plus days past due to total retained loans, Term loans originated in 2022/2021	0.35%		0.13%
% of 30 plus days past due to total retained loans, Term loans originated in 2021/2020	0.21%		0.14%
% of 30 plus days past due to total retained loans, Term loans originated in 2020/2019	0.18%		0.29%
% of 30 plus days past due to total retained loans, Term loans originated prior to 2020/2019	1.74%		2.04%
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period	0.98%		0.72%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans	4.48%		4.53%
% of 30 plus days past due to total retained loans	0.71%		0.63%
Gross charge-offs by origination year
Gross charge-offs originated in 2024/2023	$ 0		$ 0
Gross charge-offs originated in 2023/2022	0		0
Gross charge-offs originated in 2022/2021	1		0
Gross charge-offs originated in 2021/2020	1		0
Gross charge-offs originated in 2020/2019	0		4
Gross charge-offs originated prior to 2020/2019	149		167
Gross charge-offs originated within the revolving period	14		26
Gross charge-offs originated converted to term loans	4		7
Total gross charge-offs	$ 169		204
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 2024/2023	$ 8,330		23,216
Term loans originated in 2023/2022	18,007		64,366
Term loans originated in 2022/2021	62,087		84,496
Term loans originated in 2021/2020	80,903		55,546
Term loans originated in 2020/2019	53,025		21,530
Term loans originated prior to 2020/2019	72,660		59,563
Revolving loans within the revolving period	6,776		7,479
Revolving loans converted to term loans	7,331		8,151
Total retained loans	309,119		324,347
Consumer, excluding credit card \| Residential real estate \| 30–149 days past due
Loans by origination year
Term loans originated in 2024/2023	2		33
Term loans originated in 2023/2022	18		74
Term loans originated in 2022/2021	155		89
Term loans originated in 2021/2020	114		70
Term loans originated in 2020/2019	53		41
Term loans originated prior to 2020/2019	749		801
Revolving loans within the revolving period	59		49
Revolving loans converted to term loans	199		223
Total retained loans	1,349		1,380
Consumer, excluding credit card \| Residential real estate \| 150 or more days past due
Loans by origination year
Term loans originated in 2024/2023	0		1
Term loans originated in 2023/2022	5		10
Term loans originated in 2022/2021	62		17
Term loans originated in 2021/2020	56		8
Term loans originated in 2020/2019	43		21
Term loans originated prior to 2020/2019	551		456
Revolving loans within the revolving period	8		5
Revolving loans converted to term loans	145		164
Total retained loans	$ 870		$ 682

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Percentage of Loans Thirty Plus Days Past Due to Total Retained Loans, Originated Five or More Years before Latest Fiscal Year

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Percentage of Loans Thirty Plus Days Past Due to Total Retained Loans, Originated Four Years before Latest Fiscal Year

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Percentage of Loans Thirty Plus Days Past Due to Total Retained Loans, Originated Three Years before Latest Fiscal Year

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Percentage of Loans Thirty Plus Days Past Due to Total Retained Loans, Originated Two Years before Latest Fiscal Year

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

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