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Pension Plans and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Pension Plans and Other Postretirement Benefits |
Schedule of Changes in Projected Benefit Obligation | The following tables outline the change in benefit obligations and plan assets over the comparable periods:
In millions |  | 2017 |  | 2016
Change in benefit obligation: |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 844 |  | $ | 844
Interest cost |  |  | 20 |  |  | 27
Actuarial loss (gain) |  |  | (31) |  |  | 13
Benefit payments |  |  | (35) |  |  | (37)
Settlements |  |  | (667) |  |  | (3)
Benefit obligation at end of year |  | $ | 131 |  | $ | 844
Schedule of Changes in Fair Value of Plan Assets |
In millions |  | 2017 |  | 2016
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at the beginning of the year |  | $ | 624 |  | $ | 613
Actual return on plan assets |  |  | 32 |  |  | 26
Employer contributions |  |  | 46 |  |  | 25
Benefit payments |  |  | (35) |  |  | (37)
Settlements |  |  | (667) |  |  | (3)
Fair value of plan assets at the end of the year |  |  | — |  |  | 624
Funded status |  | $ | (131) |  | $ | (220)
Schedule of Net Benefit Costs | The components of net periodic benefit costs for the years ended December 31 are shown below:
In millions |  | 2017 |  | 2016 |  | 2015
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 20 |  | $ | 27 |  | $ | 31
Expected return on plan assets |  |  | (20) |  |  | (32) |  |  | (33)
Amortization of net loss |  |  | 21 |  |  | 32 |  |  | 21
Settlement losses |  |  | 187 |  |  | — |  |  | —
Net periodic pension cost |  | $ | 208 |  | $ | 27 |  | $ | 19
Schedule of Allocation of Plan Assets | The following tables show the fair value allocation of plan assets by asset category as of December 31, 2016.
|  | Fair value of plan assets at December 31, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and money market funds |  | $ | 8 |  | $ | — |  | $ | — |  | $ | 8
Fixed income funds |  |  | 3 |  |  | 580 |  |  | — |  |  | 583
Equity mutual funds |  |  | 33 |  |  | — |  |  | — |  |  | 33
Total assets at fair value |  | $ | 44 |  | $ | 580 |  | $ | — |  | $ | 624
Schedule of Expected Benefit Payments | The Company estimates the following future benefit payments which are calculated using the same actuarial assumptions used to measure the benefit obligation as of December 31, 2017:
In millions |  |  |
2018 |  | $ | 21
2019 |  |  | 14
2020 |  |  | 12
2021 |  |  | 23
2022 |  |  | 8
Thereafter |  |  | 31

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans 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=65897934&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=65897934&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=65897934&loc=d3e1928-114920 + Details
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