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Mortgage Banking Activity (Tables) | 9 Months Ended
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Sep. 30, 2025
Mortgage Banking [Abstract] |
Schedule of Residential Mortgage Loans Held for Sale | The following table summarizes activity related to residential mortgage loans held for sale as of and for the nine months ended September 30, 2025 and the year ended December 31, 2024.
MORTGAGE LOAN ACTIVITY
(Dollars in millions) |  | September 30, 2025 |  | December 31, 2024
Balance at beginning of period |  | $ | 81 |  |  | $ | 62 |
Originations and purchases |  | 853 |  |  | 951 |
Sales, net of gains |  | (800) |  |  | (932) |
Balance at end of period |  | $ | 134 |  |  | $ | 81 |
Schedule of Mortgage Servicing Rights | The following table presents the carrying values of mortgage servicing rights as of September 30, 2025 and December 31, 2024.
MORTGAGE SERVICING RIGHTS
|  | September 30, 2025 |  | December 31, 2024 |
(Dollars in millions) |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  |  |  |  |
Mortgage servicing rights |  | $ | 21 |  |  |  | $ | (7) |  |  | $ | 14 |  |  | $ | 30 |  |  | $ | (9) |  |  | $ | 21 |  |  |  |  |  |  |

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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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -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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