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Fair Value Measurements - Summary of Quantitative Information (Details) - Fair Value, Measurements, Recurring $ in Millions	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,033
Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,033
Minimum | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average cost to service per loan	$ 65
Minimum | Significant Unobservable Inputs (Level 3) | Option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	5.3
Maximum | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average cost to service per loan	$ 90
Maximum | Significant Unobservable Inputs (Level 3) | Option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	21.6
Weighted Average | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average cost to service per loan	$ 68
Weighted Average | Significant Unobservable Inputs (Level 3) | Option adjusted spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	5.9
Discounted cash flows | Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,033
Discounted cash flows | Minimum | Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	0
Discounted cash flows | Maximum | Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	10.0
Discounted cash flows | Weighted Average | Mortgage Servicing Rights | Significant Unobservable Inputs (Level 3) | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	7.9
Consensus pricing | Rate Lock Commitments | Significant Unobservable Inputs (Level 3) | Origination pull-through rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ (1)
Range (Weighted Average)	76.41

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Servicing asset at fair value amount net.

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Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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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