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Pension and Other Postretirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Reconciliation of Change in Projected Benefit Obligation and Plan Assets | The following table sets forth the reconciliation of the beginning and ending balances of the benefit obligation and plan assets, the funded status and the amounts recognized in these financial statements for the defined benefit and other postretirement plans (in millions):
|  | Pension Benefits |
|  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Accumulated benefit obligation: |  | $ | 4,739 |  |  | $ | 4,158 |
Change in projected benefit obligation: |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 5,253 |  |  | $ | 4,473 |
Service cost |  |  | 195 |  |  |  | 112 |
Interest cost |  |  | 220 |  |  |  | 200 |
Actuarial loss |  |  | 525 |  |  |  | 738 |
Gross benefits paid and settlements |  |  | (366) |  |  |  | (243) |
Other |  |  | 25 |  |  |  | (27) |
Projected benefit obligation at end of year |  | $ | 5,852 |  |  | $ | 5,253 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 3,355 |  |  | $ | 2,975 |
Actual return on plan assets |  |  | 510 |  |  |  | 230 |
Employer contributions |  |  | 419 |  |  |  | 421 |
Gross benefits paid and settlements |  |  | (366) |  |  |  | (243) |
Other |  |  | 14 |  |  |  | (28) |
Fair value of plan assets at end of year |  | $ | 3,932 |  |  | $ | 3,355 |
Funded status—Net amount recognized |  | $ | (1,920) |  |  | $ | (1,898) |
|  | Other Postretirement Benefits |
|  | Year Ended December 31, 2017 |  |  | Year Ended December 31, 2016 |
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 1,687 |  |  | $ | 2,002 |
Service cost |  |  | 13 |  |  |  | 19 |
Interest cost |  |  | 66 |  |  |  | 86 |
Plan participants’ contributions |  |  | 68 |  |  |  | 69 |
Benefits paid |  |  | (178) |  |  |  | (191) |
Actuarial loss (gain) |  |  | 40 |  |  |  | (165) |
Plan amendments |  |  | — |  |  |  | (138) |
Other |  |  | 14 |  |  |  | 5 |
Benefit obligation at end of year |  | $ | 1,710 |  |  | $ | 1,687 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 55 |  |  | $ | 56 |
Actual return on plan assets |  |  | 1 |  |  |  | 2 |
Employer contributions |  |  | 108 |  |  |  | 119 |
Plan participants’ contributions |  |  | 68 |  |  |  | 69 |
Benefits paid |  |  | (178) |  |  |  | (191) |
Fair value of plan assets at end of year |  |  | 54 |  |  |  | 55 |
Funded status—Net amount recognized |  | $ | (1,656) |  |  | $ | (1,632) |
Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss) |
| Pension Benefits |
|  | December 31, 2017 |  |  | December 31, 2016 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |
Noncurrent asset |  | $ | 9 |  |  | $ | 2 |
Current liability |  |  | (8) |  |  |  | (8) |
Noncurrent liability |  |  | (1,921) |  |  |  | (1,892) |
Total liability |  | $ | (1,920) |  |  | $ | (1,898) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | (1,610) |  |  | $ | (1,482) |
Prior service cost |  |  | (1) |  |  |  | (1) |
Total accumulated other comprehensive loss |  | $ | (1,611) |  |  | $ | (1,483) |
|  | Other Postretirement Benefits |
|  | December 31, 2017 |  |  | December 31, 2016 |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |
Current liability |  | $ | (54) |  |  | $ | (51) |
Noncurrent liability |  |  | (1,602) |  |  |  | (1,581) |
Total liability |  | $ | (1,656) |  |  | $ | (1,632) |
Amounts recognized in accumulated other comprehensive income consist of: |  |  |  |  |  |  |  |
Net actuarial gain |  | $ | 301 |  |  | $ | 384 |
Prior service credit |  |  | 208 |  |  |  | 245 |
Total accumulated other comprehensive income |  | $ | 509 |  |  | $ | 629 |
Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets | The following information relates to all pension plans with an accumulated benefit obligation and a projected benefit obligation in excess of plan assets at December 31 (in millions):
|  | 2017 |  |  | 2016 |
Projected benefit obligation |  | $ | 5,637 |  |  | $ | 5,025 |
Accumulated benefit obligation |  |  | 4,567 |  |  |  | 3,985 |
Fair value of plan assets |  |  | 3,709 |  |  |  | 3,164 |
Components Of Net Periodic Benefit Cost | Net periodic benefit cost for the years ended December 31 included the following components (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Pension Benefits |  |  | Other Postretirement Benefits |  |  | Pension Benefits |  |  | Other Postretirement Benefits |  |  | Pension Benefits |  |  | Other Postretirement Benefits |
Service cost |  | $ | 195 |  |  | $ | 13 |  |  | $ | 112 |  |  | $ | 19 |  |  | $ | 124 |  |  | $ | 21 |
Interest cost |  |  | 220 |  |  |  | 66 |  |  |  | 200 |  |  |  | 86 |  |  |  | 200 |  |  |  | 82 |
Expected return on plan assets |  |  | (243) |  |  |  | (2) |  |  |  | (216) |  |  |  | (2) |  |  |  | (194) |  |  |  | (2) |
Curtailment gain |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (107) |  |  |  | — |  |  |  | — |
Amortization of unrecognized actuarial (gain) loss |  |  | 128 |  |  |  | (33) |  |  |  | 76 |  |  |  | (19) |  |  |  | 85 |  |  |  | (22) |
Amortization of prior service credits |  |  | — |  |  |  | (37) |  |  |  | — |  |  |  | (31) |  |  |  | — |  |  |  | (32) |
Other |  |  | 5 |  |  |  | — |  |  |  | 5 |  |  |  | — |  |  |  | 4 |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 305 |  |  | $ | 7 |  |  | $ | 177 |  |  | $ | (54) |  |  | $ | 219 |  |  | $ | 47 |
Amortized Accumulated Other Comprehensive Income (Loss) Into Net Periodic Benefit Cost | The estimated amounts that will be amortized in 2018 out of accumulated other comprehensive income (loss) into net periodic benefit cost are as follows (in millions):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
Actuarial (gain) loss |  | $ | 132 |  |  | $ | (32) |
Prior service (credit) cost |  |  | — |  |  |  | (37) |
Assumptions Used for Benefit Plans | The assumptions used for the benefit plans were as follows:
|  |  | Pension Benefits |
Assumptions used to determine benefit obligations |  |  | 2017 |  |  |  | 2016 |
Discount rate |  |  | 3.65% |  |  |  | 4.18% |
Rate of compensation increase |  |  | 3.89% |  |  |  | 3.54% |
Assumptions used to determine net expense |  |  |  |  |  |  |  |
Discount rate |  |  | 4.19% |  |  |  | 4.58% |
Expected return on plan assets |  |  | 7.02% |  |  |  | 7.04% |
Rate of compensation increase |  |  | 3.54% |  |  |  | 3.53% |
|  | Other Postretirement Benefits |
Assumptions used to determine benefit obligations |  | 2017 |  |  | 2016 |
Discount rate |  |  | 3.63% |  |  |  | 4.07% |
Assumptions used to determine net expense |  |  |  |  |  |  |  |
Discount rate |  |  | 4.07% |  |  |  | 4.49% |
Expected return on plan assets |  |  | 3.00% |  |  |  | 3.00% |
Health care cost trend rate assumed for next year |  |  | 6.25% |  |  |  | 6.50% |
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2023) |  |  | 5.00% |  |  |  | 5.00% |
Allocation of Plan Assets | United’s plan assets are allocated within the following guidelines:
|  | Percent of Total |  |  | Expected Long-Term Rate of Return |
Equity securities |  |  | 27-42 % |  |  |  | 9.5 % |
Fixed-income securities |  |  | 30-40 |  |  |  | 5.5 |
Alternatives |  |  | 10-25 |  |  |  | 7.3 |
Other |  |  | 0-10 |  |  |  | 7.3 |
Effect of One-Percentage-Point Change in Assumed Health Care Trend Rate | A 1% change in the assumed health care trend rate for the Company would have the following additional effects (in millions):
|  | 1% Increase |  |  | 1% Decrease |
Effect on total service and interest cost for the year ended December 31, 2017 |  | $ | 11 |  |  | $ | (8) |
Effect on postretirement benefit obligation at December 31, 2017 |  |  | 170 |  |  |  | (149) |
Pension and Other Postretirement Plan Assets | The following tables present information about United’s pension and other postretirement plan assets at December 31 (in millions):
|  | 2017 |  |  |  |  |  | 2016 |
Pension Plan Assets: |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Assets Measured at NAV(a) |  |  |  |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Assets Measured at NAV(a) |
Equity securities funds |  | $ | 1,406 |  |  | $ | 269 |  |  | $ | 133 |  |  | $ | — |  |  | $ | 1,004 |  |  |  |  |  |  | $ | 1,173 |  |  | $ | 230 |  |  | $ | 111 |  |  | $ | — |  |  | $ | 832 |
Fixed-income securities |  |  | 1,470 |  |  |  | — |  |  |  | 834 |  |  |  | 18 |  |  |  | 618 |  |  |  |  |  |  |  | 1,298 |  |  |  | — |  |  |  | 824 |  |  |  | 11 |  |  |  | 463 |
Alternatives |  |  | 637 |  |  |  | — |  |  |  | — |  |  |  | 139 |  |  |  | 498 |  |  |  |  |  |  |  | 586 |  |  |  | — |  |  |  | — |  |  |  | 134 |  |  |  | 452 |
Other investments |  |  | 419 |  |  |  | 32 |  |  |  | 124 |  |  |  | 172 |  |  |  | 91 |  |  |  |  |  |  |  | 298 |  |  |  | 47 |  |  |  | 68 |  |  |  | 87 |  |  |  | 96 |
Total |  | $ | 3,932 |  |  | $ | 301 |  |  | $ | 1,091 |  |  | $ | 329 |  |  | $ | 2,211 |  |  |  |  |  |  | $ | 3,355 |  |  | $ | 277 |  |  | $ | 1,003 |  |  | $ | 232 |  |  | $ | 1,843 |
Other Postretirement Benefit Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit administration fund |  | $ | 54 |  |  | $ | — |  |  | $ | — |  |  | $ | 54 |  |  | $ | — |  |  |  |  |  |  | $ | 55 |  |  | $ | — |  |  | $ | — |  |  | $ | 55 |  |  | $ | — |
(a) In accordance with the relevant accounting standards, certain investments that are measured at fair value using the net asset value (“NAV”) per share (or its equivalent) have not been classified in the fair value hierarchy. These investments are commingled funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. Redemption periods for these investments range from daily to annually.
Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs (Level Three) | The reconciliation of United’s defined benefit plan assets measured at fair value using unobservable inputs (Level 3) for the years ended December 31, 2017 and 2016 is as follows (in millions):
|  | 2017 |  |  | 2016 |
Balance at beginning of year |  | $ | 287 |  |  | $ | 208 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Sold during the year |  |  | 7 |  |  |  | 4 |
Held at year end |  |  | 16 |  |  |  | 3 |
Purchases, sales, issuances and settlements (net) |  |  | 73 |  |  |  | 72 |
Balance at end of year |  | $ | 383 |  |  | $ | 287 |
Estimated Future Benefit Payments | The estimated future benefit payments, net of expected participant contributions, in United’s pension plans and other postretirement benefit plans as of December 31, 2017 are as follows (in millions):
|  | Pension |  |  | Other Postretirement |  |  | Other Postretirement— subsidy receipts |
2018 |  | $ | 305 |  |  | $ | 113 |  |  | $ | 6 |
2019 |  |  | 326 |  |  |  | 118 |  |  |  | 6 |
2020 |  |  | 331 |  |  |  | 121 |  |  |  | 6 |
2021 |  |  | 357 |  |  |  | 124 |  |  |  | 7 |
2022 |  |  | 369 |  |  |  | 126 |  |  |  | 7 |
Years 2023 – 2027 |  |  | 1,912 |  |  |  | 646 |  |  |  | 43 |
Multi-Employer Plans |
Pension Fund |  | IAM National Pension Fund
EIN/ Pension Plan Number |  | 51-6031295 - 002
Pension Protection Act Zone Status (2017 and 2016) |  | Green Zone. Plans in the green zone are at least 80 percent funded.
FIP/RP Status Pending/Implemented |  | No
United’s Contributions |  | $50 million, $41 million and $40 million in the years ended December 31, 2017, 2016 and 2015, respectively
Surcharge Imposed |  | No
Expiration Date of Collective Bargaining Agreement |  | N/A

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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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=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 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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