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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Postemployment Benefits [Abstract] |
Change in Benefit Obligation, Plan Assets and Funded Status of Defined Benefit Pension Plans | The change in benefit obligation, plan assets and the funded status of the defined benefit pension plans in the United Kingdom using a measurement date of December 31, 2023 and 2022, are as follows (in millions):
|  | Pension Benefits |
At year end |  | 2023 |  |  | 2022 |
Benefit obligation at beginning of year |  | $ | 4 |  |  | $ | 8 |
Actuarial loss (gain) |  |  | — |  |  |  | (3 | )
Plan settlements |  |  | (4 | ) |  |  | — |
Foreign currency exchange rate changes |  |  | — |  |  |  | (1 | )
Benefit obligation at end of year |  | $ | — |  |  | $ | 4 |
Fair value of plan assets at beginning of year |  | $ | 6 |  |  | $ | 9 |
Actual return |  |  | — |  |  |  | (2 | )
Plan settlements |  |  | (5 | ) |  |  | — |
Foreign currency exchange rate changes and other |  |  | (1 | ) |  |  | (1 | )
Fair value of plan assets at end of year |  | $ | — |  |  | $ | 6 |
Funded status |  |  | — |  |  |  | 2 |
Accumulated benefit obligation at end of year |  | $ | — |  |  | $ | 4 |
Assumption Rates Used for Benefit Obligations | The assumption rates used for benefit obligations are as follows:
|  | December 31,
|  | 2023 |  | 2022
Discount rate: |  | N/A |  | 4.1% - 5.10%
Assumption Rates Used for Net Periodic Benefit Costs | The assumption rates used for net periodic benefit costs are as follows:
|  | December 31,
|  | 2023 |  | 2022 |  | 2021
Discount rate: |  | 4.10% - 5.10% |  | 1.20% - 1.80% |  | 0.70% - 1.20%
Expected return on assets: |  | 4.00% - 5.12% |  | 1.10% - 2.22% |  | 0.70% - 1.78%
Plan's Assets Carried at Fair Value | The following table sets forth by level, within the fair value hierarchy, the plan’s assets carried at fair value (in millions):
|  | Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |
Annuity contract |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total fair value measurements |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |
Annuity contract |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 3 |
Other |  |  | 3 |  |  |  | — |  |  |  | 3 |  |  |  | — |
Total fair value measurements |  | $ | 6 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 3 |

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