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Employee Bargaining Agreements and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019, are as follows (in millions):
|  | Pension Benefits |
At year end |  | 2020 |  |  | 2019 |
Benefit obligation at beginning of year |  | $ | 11 |  |  | $ | 11 |
Service cost |  |  | — |  |  |  | — |
Interest cost |  |  | — |  |  |  | — |
Actuarial loss (gain) |  |  | 6 |  |  |  | — |
Benefits paid |  |  | — |  |  |  | — |
Participants contributions |  |  | — |  |  |  | — |
Plan settlements |  |  | (8 | ) |  |  | — |
Foreign currency exchange rate changes |  |  | — |  |  |  | — |
Acquisitions (disposals) |  |  | — |  |  |  | — |
Benefit obligation at end of year |  | $ | 9 |  |  | $ | 11 |
Fair value of plan assets at beginning of year |  | $ | 16 |  |  | $ | 15 |
Actual return |  |  | — |  |  |  | 1 |
Benefits paid |  |  | — |  |  |  | — |
Company contributions |  |  | 3 |  |  |  | — |
Participants contributions |  |  | — |  |  |  | — |
Plan settlements |  |  | (8 | ) |  |  | — |
Foreign currency exchange rate changes |  |  | — |  |  |  | — |
Acquisitions (disposals) |  |  | — |  |  |  | — |
Fair value of plan assets at end of year |  | $ | 11 |  |  | $ | 16 |
Funded status |  |  | 2 |  |  |  | 5 |
Accumulated benefit obligation at end of year |  | $ | 9 |  |  | $ | 11 |
Assumption Rates Used for Benefit Obligations | The assumption rates used for benefit obligations are as follows:
|  | December 31,
|  | 2020 |  | 2019
Discount rate: |  | 0.70% - 1.20% |  | 2.00% - 2.10%
Assumption Rates Used for Net Periodic Benefit Costs | The assumption rates used for net periodic benefit costs are as follows:
|  | December 31, |
|  | 2020 |  | 2019 |  | 2018 |
Discount rate: |  | 2.00% - 2.10% |  | 2.65% - 2.90% |  | 2.50% |
Expected return on assets: |  | 2.54% - 3.03% |  | 3.02% - 3.62% |  | 3.10% - 4.17% |
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 (1) |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annuity contract |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 6 |
Other |  |  | 5 |  |  |  | 1 |  |  |  | 4 |  |  |  | — |
Total fair value measurements |  | $ | 11 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 6 |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 6 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
Fixed income securities |  |  | 5 |  |  |  | 5 |  |  |  | — |  |  |  | — |
Other |  |  | 5 |  |  |  | 1 |  |  |  | 4 |  |  |  | — |
Total fair value measurements |  | $ | 16 |  |  | $ | 12 |  |  | $ | 4 |  |  | $ | — |
| (1) | Transfers of $6 million into Level 3 in the fair value hierarchy consist of the buy-in annuity contract entered into during 2020. Fair value is estimated by adjusting the premium paid by movements in gilt yields during the reporting period. |

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