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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2019
Employee-related Liabilities [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Defined Benefit Pension and Other Postretirement Benefit Plans. The Company's net periodic benefit cost includes the following components for the three months ended March 31 (in millions):
|  | Pension Benefits |  | Other Postretirement Benefits |  | Affected Line Item in the Statements of Consolidated Operations
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  |
Service cost |  | $ | 46 |  |  | $ | 57 |  |  | $ | 2 |  |  | $ | 3 |  |  | Salaries and related costs
Interest cost |  | 57 |  |  | 54 |  |  | 15 |  |  | 15 |  |  | Miscellaneous, net
Expected return on plan assets |  | (72 | ) |  | (73 | ) |  | — |  |  | — |  |  | Miscellaneous, net
Amortization of unrecognized (gain) loss |  | 29 |  |  | 33 |  |  | (15 | ) |  | (8 | ) |  | Miscellaneous, net
Amortization of prior service credit |  | — |  |  | — |  |  | (10 | ) |  | (9 | ) |  | Miscellaneous, net
Total |  | $ | 60 |  |  | $ | 71 |  |  | $ | (8 | ) |  | $ | 1 |  |  |
During the three months ended March 31, 2019, the Company contributed $150 million to its U.S. domestic tax-qualified defined benefit pension plans. Share-Based Compensation. In the three months ended March 31, 2019, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 0.5 million restricted stock units ("RSUs"), half of which are time-vested RSUs and half of which are performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a three-year period from the date of grant. The amount of performance-based RSUs vest based on the Company's relative improvement in pre-tax margin, as compared to a group of industry peers, for the three years ending December 31, 2021. All RSUs are generally equity awards settled in stock for domestic employees and liability awards settled in cash for international employees. The cash payments are based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The table below presents information related to share-based compensation (in millions):
| Three Months Ended March 31,
| 2019 |  | 2018
Share-based compensation expense | $ | 16 |  |  | $ | 17 |
| March 31, 2019 |  | December 31, 2018
Unrecognized share-based compensation | $ | 84 |  |  | $ | 68 |

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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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