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Mortgage Banking Activity (Tables) | 12 Months Ended
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Dec. 31, 2022
Mortgage Banking [Abstract] |
Schedule of Mortgage Loans Held-for-Sale | The following table summarizes activity relating to residential mortgage loans held for sale for the years ended December 31, 2022, 2021, and 2020: Table 8.7.1 MORTGAGE LOAN ACTIVITY
(Dollars in millions) |  | 2022 |  | 2021 |  | 2020
Balance at beginning of period |  | $ | 250 |  |  | $ | 409 |  |  | $ | 4 |
Acquired |  | — |  |  | — |  |  | 320 |
Originations and purchases |  | 1,275 |  |  | 2,836 |  |  | 2,499 |
Sales, net of gains |  | (1,481) |  |  | (3,025) |  |  | (2,405) |
Mortgage loans transferred from (to) held for investment |  | — |  |  | 30 |  |  | (9) |
Balance at end of period |  | $ | 44 |  |  | $ | 250 |  |  | $ | 409 |
Servicing Asset at Amortized Cost | Mortgage servicing rights had the following carrying values as of the period indicated. Table 8.7.2 MORTGAGE SERVICING RIGHTS
| December 31, 2022 |  |
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  |  |  |  |
Mortgage servicing rights | $ | 21 |  |  | $ | (5) |  |  | $ | 16 |  |  |  |  |  |  |
| December 31, 2021 |  |  |  |  |  |
(Dollars in millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  |  |  |  |  |
Mortgage servicing rights | $ | 39 |  |  | $ | (9) |  |  | $ | 30 |  |  |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122739-111746 + Details
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