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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Components of Net Periodic Benefit Cost | The Company’s net periodic benefit cost includes the following components (in millions):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | Three Months Ended September 30, |  |  | Three Months Ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 48 |  |  | $ | 29 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost |  |  | 55 |  |  |  | 50 |  |  |  | 16 |  |  |  | 22 |
Expected return on plan assets |  |  | (61) |  |  |  | (54) |  |  |  | — |  |  |  | — |
Amortization of unrecognized (gain) loss and prior service cost (credit) |  |  | 32 |  |  |  | 19 |  |  |  | (18) |  |  |  | (13) |
Settlement loss |  |  | 3 |  |  |  | 2 |  |  |  | — |  |  |  | — |
Curtailment gain |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (47) |
Total |  | $ | 77 |  |  | $ | 46 |  |  | $ | 2 |  |  | $ | (34) |
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | Nine Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 146 |  |  | $ | 84 |  |  | $ | 10 |  |  | $ | 14 |
Interest cost |  |  | 165 |  |  |  | 151 |  |  |  | 50 |  |  |  | 66 |
Expected return on plan assets |  |  | (182) |  |  |  | (162) |  |  |  | (1) |  |  |  | (1) |
Amortization of unrecognized (gain) loss and prior service cost (credit) |  |  | 95 |  |  |  | 57 |  |  |  | (54) |  |  |  | (40) |
Settlement loss |  |  | 5 |  |  |  | 4 |  |  |  | — |  |  |  | — |
Curtailment gain |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (47) |
Total |  | $ | 229 |  |  | $ | 134 |  |  | $ | 5 |  |  | $ | (8) |
Share-Based Compensation Expense | The table below presents information related to share-based compensation (in millions):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Share-based compensation expense |  | $ | 10 |  |  | $ | 23 |  |  | $ | 66 |  |  | $ | 36 |
|  | September 30, 2017 |  |  | December 31, 2016 |  |  |  |  |  |  |
Unrecognized share-based compensation |  | $ | 90 |  |  | $ | 65 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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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