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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Employee-related Liabilities [Abstract] |
Components of Net Periodic Benefit Cost | The Company's net periodic benefit cost includes the following components for the three months ended September 30 (in millions):
|  | Pension Benefits |  | Other Postretirement Benefits |  | Affected Line Item in the Statements of Consolidated Operations
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Service cost |  | $ | 57 |  |  | $ | 48 |  |  | $ | 3 |  |  | $ | 4 |  |  | Salaries and related costs
Interest cost |  | 54 |  |  | 55 |  |  | 16 |  |  | 16 |  |  | Miscellaneous, net
Expected return on plan assets |  | (73 | ) |  | (61 | ) |  | (1 | ) |  | — |  |  | Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit) |  | 32 |  |  | 32 |  |  | (17 | ) |  | (18 | ) |  | Miscellaneous, net
Settlement loss |  | — |  |  | 3 |  |  | — |  |  | — |  |  | Miscellaneous, net
Total |  | $ | 70 |  |  | $ | 77 |  |  | $ | 1 |  |  | $ | 2 |  |  |
The Company's net periodic benefit cost includes the following components for the nine months ended September 30 (in millions):
|  | Pension Benefits |  | Other Postretirement Benefits |  | Affected Line Item in the Statements of Consolidated Operations
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Service cost |  | $ | 171 |  |  | $ | 146 |  |  | $ | 9 |  |  | $ | 10 |  |  | Salaries and related costs
Interest cost |  | 162 |  |  | 165 |  |  | 46 |  |  | 50 |  |  | Miscellaneous, net
Expected return on plan assets |  | (219 | ) |  | (182 | ) |  | (1 | ) |  | (1 | ) |  | Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit) |  | 97 |  |  | 95 |  |  | (52 | ) |  | (54 | ) |  | Miscellaneous, net
Settlement loss |  | — |  |  | 5 |  |  | — |  |  | — |  |  | Miscellaneous, net
Total |  | $ | 211 |  |  | $ | 229 |  |  | $ | 2 |  |  | $ | 5 |  |  |
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,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Share-based compensation expense | $ | 29 |  |  | $ | 10 |  |  | $ | 73 |  |  | $ | 66 |
|  | September 30, 2018 |  | December 31, 2017 |  |  |  |
Unrecognized share-based compensation | $ | 69 |  |  | $ | 53 |  |  |  |  |

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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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