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Significant Accounting Policies (Tables)
12 Months Ended
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,
20232022
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 development300 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,
202320222021
Beginning balance, mortgage servicing rights$561 $579 $557 
Mortgage servicing rights recognized82 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,
202320222021
Weighted average discount rate
12.96 %12.87 %12.62 %
Weighted average conditional prepayment rate
11.97 %10.12 %9.78 %