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Mortgage Banking Activity (Tables) | 12 Months Ended
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Dec. 31, 2023
Mortgage Banking [Abstract] |
Schedule of Residential Mortgage Loans Held For Sale | The following table summarizes activity relating to residential mortgage loans held for sale for the years ended December 31, 2023, 2022, and 2021: Table 8.7.1 MORTGAGE LOAN ACTIVITY
(Dollars in millions) |  | 2023 |  | 2022 |  | 2021
Balance at beginning of period |  | $ | 44 |  |  | $ | 250 |  |  | $ | 409 |
Originations and purchases |  | 692 |  |  | 1,275 |  |  | 2,836 |
Sales, net of gains |  | (674) |  |  | (1,481) |  |  | (3,025) |
Mortgage loans transferred from (to) held for investment |  | — |  |  | — |  |  | 30 |
Balance at end of period |  | $ | 62 |  |  | $ | 44 |  |  | $ | 250 |
Schedule of Mortgage Servicing Rights | Mortgage servicing rights had the following carrying values as of the periods indicated in the table below. Table 8.7.2 MORTGAGE SERVICING RIGHTS
| December 31, 2023 |  |
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  |  |  |  |
Mortgage servicing rights | $ | 25 |  |  | $ | (7) |  |  | $ | 18 |  |  |  |  |  |  |
| December 31, 2022 |  |  |  |  |  |
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  |  |  |  |
Mortgage servicing rights | $ | 21 |  |  | $ | (5) |  |  | $ | 16 |  |  |  |  |  |  |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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