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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Changes in Accumulated Postemployment Benefit Obligations | The following table shows the change in the accumulated postretirement benefit obligation ("APBO") for the years ended December 31, 2018 and 2017:
(in millions) |  | 2018 |  | 2017
APBO at beginning of period |  | $ | 275 |  |  | $ | 256 |
Service cost |  | 18 |  |  | 18 |
Interest cost |  | 9 |  |  | 11 |
Benefits paid |  | (5 | ) |  | (8 | )
Actuarial gain |  | (69 | ) |  | (2 | )
Plan amendments |  | 4 |  |  | — |
APBO at end of period |  | $ | 232 |  |  | $ | 275 |
Schedule of Amounts Recognized in Balance Sheet | The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2018 and 2017.
(in millions) |  | 2018 |  | 2017
Funded status |  | $ | (232 | ) |  | $ | (275 | )
Unrecognized net actuarial (gain) loss |  | (64 | ) |  | 5 |
Unrecognized prior service cost |  | 5 |  |  | 4 |
Accumulated other comprehensive income (loss) |  | 59 |  |  | (9 | )
Cost recognized on Consolidated Balance Sheet |  | $ | (232 | ) |  | $ | (275 | )
Schedule of Net Benefit Costs | The consolidated periodic postretirement benefit cost for the years ended December 31, 2018, 2017, and 2016, included the following:
(in millions) |  | 2018 |  | 2017 |  | 2016
Service cost |  | $ | 18 |  |  | $ | 18 |  |  | $ | 13 |
Interest cost |  | 9 |  |  | 11 |  |  | 9 |
Amortization of prior service cost |  | 3 |  |  | 3 |  |  | 3 |
Net periodic postretirement benefit cost |  | $ | 30 |  |  | $ | 32 |  |  | $ | 25 |
Schedule of Assumptions Used | The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2018, 2017, and 2016:
|  | 2018 |  | 2017 |  | 2016
Weighted-average discount rate |  | 4.35 | % |  | 3.65 | % |  | 4.25 | %
Assumed healthcare cost trend rate (a) |  | 7.13 | % |  | 7.08 | % |  | 7.08 | %
(a) | The assumed healthcare cost trend rate is assumed to be 7.13% for 2019, then decline gradually to 5.19% by 2027 and remain level thereafter.

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the accumulated postemployment benefit obligation from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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