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Employee Bargaining Agreements and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016, are as follows (in millions):
|  | Pension Benefits |
At year end |  | 2017 |  |  | 2016 |
Benefit obligation at beginning of year |  | $ | 13 |  |  | $ | 16 |
Interest cost |  |  | — |  |  |  | 1 |
Actuarial loss (gain) |  |  | 1 |  |  |  | 3 |
Benefits paid |  |  | — |  |  |  | (1 | )
Plan settlements |  |  | — |  |  |  | (3 | )
Foreign currency exchange rate changes |  |  | (1 | ) |  |  | (3 | )
Acquisitions (disposals) |  |  | — |  |  |  | — |
Benefit obligation at end of year |  |  | 13 |  |  |  | 13 |
Fair value of plan assets at beginning of year |  | $ | 15 |  |  | $ | 18 |
Actual return |  |  | 2 |  |  |  | 2 |
Benefits paid |  |  | — |  |  |  | (1 | )
Company contributions |  |  | 1 |  |  |  | 1 |
Plan settlements |  |  | — |  |  |  | (3 | )
Foreign currency exchange rate changes |  |  | — |  |  |  | (2 | )
Acquisitions (disposals) |  |  | — |  |  |  | — |
Fair value of plan assets at end of year |  |  | 18 |  |  |  | 15 |
Funded status |  |  | 5 |  |  |  | 2 |
Accumulated benefit obligation at end of year |  |  | 13 |  |  |  | 13 |
Assumption Rates Used for Benefit Obligations | The assumption rates used for benefit obligations are as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Discount rate: |  |  | 2.50 | % |  |  | 2.70 | %
Assumption Rates Used for Net Periodic Benefit Costs | The assumption rates used for net periodic benefit costs are as follows:
|  | December 31,
|  | 2017 |  |  | 2016 |  |  | 2015
Discount rate: |  | 2.70% |  |  | 3.70% |  |  | 3.10% - 3.90%
Expected return on assets: |  | 3.27% - 4.27% |  |  | 4.04% - 4.50% |  |  | 2.13% - 5.50%
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, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 8 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |
Fixed Income Securities |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
Other |  |  | 4 |  |  |  | — |  |  |  | 4 |  |  |  | — |
Total Fair Value Measurements |  | $ | 15 |  |  | $ | 11 |  |  | $ | 4 |  |  | $ | — |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 10 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |
Fixed Income Securities |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
Other |  |  | 5 |  |  |  | — |  |  |  | 5 |  |  |  | — |
Total Fair Value Measurements |  | $ | 18 |  |  | $ | 13 |  |  | $ | 5 |  |  | $ | — |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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