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Assets Held for Sale and Associated Liabilities - Summary of Assets and Liabilities Related to the Sale (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Other assets	$ 60
Assets held for sale	1,631	$ 0
Liabilities associated with assets held for sale	471	$ 0
Discontinued Operations, Held-for-Sale
Servicing Assets at Fair Value [Line Items]
Mortgage servicing rights	1,105
Loans	465
Other assets	61
Assets held for sale	1,631
Other liabilities	471
Liabilities associated with assets held for sale	$ 471

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