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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Summary of Real Estate Assets | A summary of our real estate assets is as follows (dollars in millions):
| December 31,
| 2023 |  | 2022
Real estate under development, current (included in other current assets) | $ | — |  |  | $ | 193 |
Real estate and other assets held for sale (included in other current assets) | 42 |  |  | 97 |
Real estate under development | 300 |  |  | 172 |
Real estate held for investment (included in other assets, net) | 179 |  |  | 45 |
Total real estate | $ | 521 |  |  | $ | 507 |
Schedule of Loan Servicing Rights Recognized | The amount of MSRs recognized during the years ended December 31, 2023, 2022 and 2021 was as follows (dollars in millions):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Beginning balance, mortgage servicing rights | $ | 561 |  |  | $ | 579 |  |  | $ | 557 |
Mortgage servicing rights recognized | 82 |  |  | 146 |  |  | 194 |
Mortgage servicing rights sold | — |  |  | — |  |  | — |
Amortization expense | (144) |  |  | (164) |  |  | (172) |
Ending balance, mortgage servicing rights | $ | 499 |  |  | $ | 561 |  |  | $ | 579 |
Schedule of Assumptions Used in Measuring Fair Value of Servicing Assets | The key assumptions used during the years ended December 31, 2023, 2022 and 2021 in measuring fair value were as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Weighted average discount rate | 12.96 | % |  | 12.87 | % |  | 12.62 | %
Weighted average conditional prepayment rate | 11.97 | % |  | 10.12 | % |  | 9.78 | %

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- Definition Tabular disclosure of assumptions used by the reporting entity in measuring the fair value of servicing assets. + References No definition available. + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-3 + Details
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