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Employee Bargaining Agreements and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 and 2020, are as follows (in millions):
|  | Pension Benefits |
At year end |  | 2021 |  |  | 2020 |
Benefit obligation at beginning of year |  | $ | 9 |  |  | $ | 11 |
Actuarial loss (gain) |  |  | 1 |  |  |  | 6 |
Plan settlements |  |  | (2 | ) |  |  | (8 | )
Benefit obligation at end of year |  | $ | 8 |  |  | $ | 9 |
Fair value of plan assets at beginning of year |  | $ | 11 |  |  | $ | 16 |
Company contributions |  |  | — |  |  |  | 3 |
Plan settlements |  |  | (2 | ) |  |  | (8 | )
Fair value of plan assets at end of year |  | $ | 9 |  |  | $ | 11 |
Funded status |  |  | 1 |  |  |  | 2 |
Accumulated benefit obligation at end of year |  | $ | 8 |  |  | $ | 9 |
Assumption Rates Used for Benefit Obligations | The assumption rates used for benefit obligations are as follows:
|  | December 31,
|  | 2021 |  | 2020
Discount rate: |  | 1.20% - 1.80% |  | 0.70% - 1.20%
Assumption Rates Used for Net Periodic Benefit Costs | The assumption rates used for net periodic benefit costs are as follows:
|  | December 31,
|  | 2021 |  | 2020 |  | 2019
Discount rate: |  | 0.70% - 1.20% |  | 2.00% - 2.10% |  | 2.65% - 2.90%
Expected return on assets: |  | 0.70% - 1.78% |  | 2.54% - 3.03% |  | 3.02% - 3.62%
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, 2021: |  |  |  |  |  |  |  |  |  |  |  |
Annuity contract |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |
Other |  |  | 4 |  |  |  | 1 |  |  |  | 3 |  |  |  | — |
Total fair value measurements |  | $ | 9 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 5 |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |
Annuity contract |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 6 |
Other |  |  | 5 |  |  |  | 1 |  |  |  | 4 |  |  |  | — |
Total fair value measurements |  | $ | 11 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 6 |
(1) Tran sfers of $6 million int o 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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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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