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Fair Value Measurements - Assets Measured by using Significant Unobservable Inputs (Details) - Significant Unobservable Inputs (Level 3) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at Beginning of Year | $ 1,033 |
Total Gains / (Losses) Recorded in Earnings | $ (10) | [1]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Return On Mortgage Servicing Rights |
Purchases / Originations | $ 24 |
Transfers In (Out) | (15) |
Balance at End of Year | 1,032 |
Mortgage Servicing Rights |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at Beginning of Year | 1,012 | [1]
Total Gains / (Losses) Recorded in Earnings | $ 2 | [1]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Return On Mortgage Servicing Rights |
Purchases / Originations | $ 19 | [1]
Balance at End of Year | 1,033 | [1]
Rate Lock Commitments Net |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at Beginning of Year | 21 | [2]
Total Gains / (Losses) Recorded in Earnings | $ (12) | [1],[2]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net Return On Mortgage Servicing Rights |
Purchases / Originations | $ 5 | [2]
Transfers In (Out) | (15) | [2]
Balance at End of Year | $ (1) | [1],[2]
[1] | We utilized swaptions, futures, forward agency and loan sales and interest rate swaps to manage the risk associated with mortgage servicing rights and rate lock commitments. Gains and losses for individual lines do not reflect the effect of our risk management activities related to such Level 3 instruments.
[2] | Rate lock commitments are reported on a fallout-adjusted basis. Transfers out of Level 3 represent the settlement value of the commitments that are transferred to LHFS, which are classified as Level 2 assets.

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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