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Benefit Plans | 9 Months Ended
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Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Benefit Plans | 9. Benefit Plans The Company has several non-contributory defined benefit plans and postretirement benefit plans covering eligible employees and retirees. The following table presents the components of net periodic benefit cost for the plans:
|  | Pension Benefits |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 10 |
Interest cost |  |  | 33 |  |  |  | 31 |  |  |  | 97 |  |  |  | 95 |
Expected return on plan assets |  |  | (45) |  |  |  | (48) |  |  |  | (133) |  |  |  | (145) |
Amortization of unrecognized net loss |  |  | 11 |  |  |  | 9 |  |  |  | 34 |  |  |  | 32 |
Settlement charge |  |  | 1 |  |  |  | 2 |  |  |  | 3 |  |  |  | 2 |
Net periodic benefit cost |  | $ | 2 |  |  | $ | (4) |  |  | $ | 7 |  |  | $ | (6) |
|  | Other Postretirement Benefits |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 2 |
Expected return on plan assets |  |  | (1) |  |  |  | (1) |  |  |  | (3) |  |  |  | (3) |
Amortization of unrecognized prior service benefit |  |  | (1) |  |  |  | (3) |  |  |  | (3) |  |  |  | (8) |
Amortization of unrecognized net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Net periodic benefit cost |  | $ | - |  |  | $ | (2) |  |  | $ | (3) |  |  | $ | (7) |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: 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=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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