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Fair Value Measures - Quantitative Information about Recurring Level 3 Fair Value Financial Instruments (Details)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Assets:
Mortgage servicing rights	$ 1,034,000,000	$ 1,033,000,000
Recurring
Assets:
Mortgage servicing rights	1,034,000,000	1,033,000,000
Recurring | Rate lock commitments
Liabilities:
Rate lock commitments (net)	7,000,000	10,000,000
Significant Unobservable Inputs (Level 3) | Recurring
Assets:
Mortgage servicing rights	1,034,000,000	1,033,000,000
Significant Unobservable Inputs (Level 3) | Recurring | Rate lock commitments
Liabilities:
Rate lock commitments (net)	$ 7,000,000	$ 10,000,000
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Minimum | Recurring
Assets:
Mortgage servicing rights, measurement input	0.049
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Maximum | Recurring
Assets:
Mortgage servicing rights, measurement input	0.225
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Weighted average | Recurring
Assets:
Mortgage servicing rights, measurement input	0.058
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Minimum | Recurring
Assets:
Mortgage servicing rights, measurement input	0
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Maximum | Recurring
Assets:
Mortgage servicing rights, measurement input	0.105
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Weighted average | Recurring
Assets:
Mortgage servicing rights, measurement input	0.081
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Minimum | Recurring
Assets:
Mortgage servicing rights, measurement input	65
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Maximum | Recurring
Assets:
Mortgage servicing rights, measurement input	90
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Weighted average | Recurring
Assets:
Mortgage servicing rights, measurement input	68
Significant Unobservable Inputs (Level 3) | Origination pull-through rate | Recurring
Liabilities:
Rate lock commitments (net), measurement input	0.7720

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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