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Fair Value - Schedule of Fair Value, Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | $ 73 | $ 49
Loans - collateral dependent loans | 126,696 | 64,312
Mortgage servicing rights | 42 | 47
Level 1 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Mortgage servicing rights | 0 | 0
Level 2 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 38 | 4
Loans - collateral dependent loans | 1,479 | 1,679
Mortgage servicing rights | 0 | 0
Level 3 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 35 | 45
Loans - collateral dependent loans | 125,217 | 62,633
Mortgage servicing rights | 42 | 47
Fair Value, Nonrecurring | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 12 | 23
Loans - collateral dependent loans | 265 | 149
Other real estate owned | 16 | 43
Mortgage servicing rights |  | 0
Fair Value Measurements | 293 | 215
Fair Value, Nonrecurring | Changes Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | (4) | (1)
Loans - collateral dependent loans | (131) | (24)
Other real estate owned | 4 | 14
Mortgage servicing rights |  | 1
Fair Value Measurements | (131) | (10)
Fair Value, Nonrecurring | Level 1 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Other real estate owned | 0 | 0
Mortgage servicing rights |  | 0
Fair Value Measurements | 0 | 0
Fair Value, Nonrecurring | Level 2 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Other real estate owned | 0 | 0
Mortgage servicing rights |  | 0
Fair Value Measurements | 0 | 0
Fair Value, Nonrecurring | Level 3 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 12 | 23
Loans - collateral dependent loans | 265 | 149
Other real estate owned | 16 | 43
Mortgage servicing rights |  | 0
Fair Value Measurements | $ 293 | $ 215

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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