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Loans - Consumer, Excluding Credit Card Loan Portfolio, Auto and Other, Nonaccrual Loans and Other Credit Quality Indicators and Loan Modifications (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	$ 1,299,590,000,000	$ 1,280,870,000,000	$ 1,089,598,000,000
Consumer, excluding credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	376,334,000,000	397,275,000,000	$ 300,753,000,000
Consumer, excluding credit card \| Auto and other
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	249,000,000	177,000,000
Retained loans	66,821,000,000	70,866,000,000
Commitments to lend to borrowers experiencing financial difficulty	0	0
Consumer, excluding credit card \| Auto and other \| California
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	10,321,000,000	10,959,000,000
Consumer, excluding credit card \| Auto and other \| Texas
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	7,772,000,000	8,502,000,000
Consumer, excluding credit card \| Auto and other \| Florida
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	5,428,000,000	5,684,000,000
Consumer, excluding credit card \| Auto and other \| New York
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	4,905,000,000	4,938,000,000
Consumer, excluding credit card \| Auto and other \| Illinois
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	2,890,000,000	3,147,000,000
Consumer, excluding credit card \| Auto and other \| New Jersey
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	2,468,000,000	2,609,000,000
Consumer, excluding credit card \| Auto and other \| Pennsylvania
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	2,012,000,000	1,900,000,000
Consumer, excluding credit card \| Auto and other \| Georgia
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	1,716,000,000	1,912,000,000
Consumer, excluding credit card \| Auto and other \| Arizona
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	1,643,000,000	1,779,000,000
Consumer, excluding credit card \| Auto and other \| North Carolina
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	1,597,000,000	1,714,000,000
Consumer, excluding credit card \| Auto and other \| All other
Financing Receivable, Credit Quality Indicator [Line Items]
Retained loans	$ 26,069,000,000	$ 27,722,000,000