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Note 9. Employee Benefit Plans Employee Benefit Plans (Notes) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS DEFINED BENEFIT PENSION PLAN The Company’s defined benefit pension plan was closed to new entrants as of July 1, 1997 and existing participants do not accrue any additional benefits. The net periodic pension cost for both 2017 and 2016 was $1 million and was comprised of interest cost of approximately $6 million and the amortization of the actuarial net loss of $2 million, partially offset by a benefit of $7 million for the expected return on assets. At December 31, 2017 and 2016, the accumulated benefit obligation of this plan was $145 million and $147 million, respectively, and the fair value of the plan assets were $108 million and $104 million, respectively, resulting in an unfunded accumulated benefit obligation of $37 million and $43 million, respectively, which is recorded in Other non-current liabilities in the Consolidated Balance Sheets. Estimated future benefit payments as of December 31, 2017 are as follows:
Year |  | Amount
2018 |  | $ | 9 |
2019 |  | 9 |
2020 |  | 9 |
2021 |  | 10 |
2022 |  | 10 |
2023 through 2027 |  | 47 |
The minimum funding required during 2018 is estimated to be $3 million. The following table presents the fair values of plan assets by category as of December 31, 2017:
Asset Category |  | Quoted Price in Active Market for Identical Assets (Level I) |  | Significant Other Observable Inputs (Level II) |  | Significant Unobservable Inputs (Level III) |  | Total
Cash and cash equivalents |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Equity securities |  | — |  |  | 71 |  |  | — |  |  | 71 |
Fixed income securities |  | — |  |  | 36 |  |  | — |  |  | 36 |
Total |  | $ | 1 |  |  | $ | 107 |  |  | $ | — |  |  | $ | 108 |
The following table presents the fair values of plan assets by category as of December 31, 2016:
Asset Category |  | Quoted Price in Active Market for Identical Assets (Level I) |  | Significant Other Observable Inputs (Level II) |  | Significant Unobservable Inputs (Level III) |  | Total
Cash and cash equivalents |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Equity securities |  | — |  |  | 74 |  |  | — |  |  | 74 |
Fixed income securities |  | — |  |  | 29 |  |  | — |  |  | 29 |
Total |  | $ | 1 |  |  | $ | 103 |  |  | $ | — |  |  | $ | 104 |
OTHER EMPLOYEE BENEFIT PLANS The Company also maintains post-retirement health and welfare plans for certain subsidiaries and a non-qualified pension plan for certain individuals. At both December 31, 2017 and 2016, the related projected benefit obligation for these plans accrued on the Company’s Consolidated Balance Sheets (primarily within other non-current liabilities) was $6 million. DEFINED CONTRIBUTION SAVINGS PLAN The Company sponsors a defined contribution savings plan that provides certain of its eligible employees an opportunity to accumulate funds for retirement and has a Company match for a portion of the contributions made by participating employees. The Company’s cost for contributions to this plan was $16 million, $15 million and $14 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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