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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016:
(in millions) |  | 2017 |  | 2016
APBO at beginning of period |  | $ | 256 |  |  | $ | 201 |
Service cost |  | 18 |  |  | 13 |
Interest cost |  | 11 |  |  | 9 |
Benefits paid |  | (8 | ) |  | (6 | )
Actuarial (gain)/loss |  | (2 | ) |  | 38 |
Plan amendments |  | — |  |  | 1 |
APBO at end of period |  | $ | 275 |  |  | $ | 256 |
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, 2017 and 2016.
(in millions) |  | 2017 |  | 2016
Funded status |  | $ | (275 | ) |  | $ | (256 | )
Unrecognized net actuarial loss |  | 5 |  |  | 7 |
Unrecognized prior service cost |  | 4 |  |  | 7 |
Accumulated other comprehensive loss |  | (9 | ) |  | (14 | )
Cost recognized on Consolidated Balance Sheet |  | $ | (275 | ) |  | $ | (256 | )
Schedule of Net Benefit Costs | The consolidated periodic postretirement benefit cost for the years ended December 31, 2017, 2016, and 2015, included the following:
(in millions) |  | 2017 |  | 2016 |  | 2015
Service cost |  | $ | 18 |  |  | $ | 13 |  |  | $ | 11 |
Interest cost |  | 11 |  |  | 9 |  |  | 7 |
Amortization of prior service cost |  | 3 |  |  | 3 |  |  | 3 |
Recognized actuarial gain |  | — |  |  | — |  |  | (3 | )
Net periodic postretirement benefit cost |  | $ | 32 |  |  | $ | 25 |  |  | $ | 18 |
Schedule of Assumptions Used | The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2017, 2016, and 2015:
|  | 2017 |  | 2016 |  | 2015
Weighted-average discount rate |  | 3.65 | % |  | 4.25 | % |  | 4.50 | %
Assumed healthcare cost trend rate (1) |  | 7.08 | % |  | 7.08 | % |  | 7.08 | %
(1) | The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2018, then decline gradually to 5.19% by 2028 and remain level thereafter.
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2017, would have the following effects:
(in millions) |  | 1% increase |  | 1% decrease
Increase (decrease) in total service and interest costs |  | $ | 5 |  |  | $ | (4 | )
Increase (decrease) in the APBO |  | $ | 37 |  |  | $ | (32 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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