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Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | The following table presents the components of net periodic (benefit) cost for the plans:
|  | Pension Benefits |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |
Interest cost |  |  | 30 |  |  |  | 28 |  |  |  | 59 |  |  |  | 55 |
Expected return on plan assets |  |  | (40 | ) |  |  | (45 | ) |  |  | (80 | ) |  |  | (90 | )
Amortization of unrecognized net loss |  |  | 12 |  |  |  | 10 |  |  |  | 23 |  |  |  | 21 |
Settlement charge |  |  | 2 |  |  |  | 3 |  |  |  | 2 |  |  |  | 7 |
Net periodic (benefit) cost |  | $ | 5 |  |  | $ | (2 | ) |  | $ | 7 |  |  | $ | (3 | )
|  | Other Postretirement Benefits |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  |  |  |  |  |  |  |  |  | $ | 1 |  |  | $ | 1 |
Expected return on plan assets |  | $ | (1 | ) |  | $ | (1 | ) |  |  | (2 | ) |  |  | (2 | )
Amortization of unrecognized prior service benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1 | )
Net periodic benefit |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (2 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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