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RETIREMENT AND OTHER BENEFIT PROGRAMS | 3 Months Ended
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Mar. 31, 2016
RETIREMENT AND OTHER BENEFIT PROGRAMS | 10. RETIREMENT AND OTHER BENEFIT PROGRAMS The following is a summary of net periodic benefit cost relating to the company’s pension and other postemployment benefit (OPEB) plans.
|  | Three months ended |
|  | March 31, |
(in millions) |  | 2016 |  |  | 2015 |
Pension benefits |  |  |  |  |  |  |  |
Service cost |  |  | $ 23 |  |  |  | $ 23 |
Interest cost |  |  | 46 |  |  |  | 49 |
Expected return on plan assets |  |  | (75 | ) |  |  | (61 | )
Amortization of net losses and other deferred amounts |  |  | 37 |  |  |  | 43 |
Net periodic pension benefit cost |  |  | $ 31 |  |  |  | $ 54 |
OPEB |  |  |  |  |  |  |  |
Service cost |  |  | $ 1 |  |  |  | $ 1 |
Interest cost |  |  | 2 |  |  |  | 6 |
Amortization of net loss and prior service credit |  |  | (4 | ) |  |  | (1 | )
Net periodic OPEB cost |  |  | $ (1 | ) |  |  | $ 6 |

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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=49170332&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=58740216&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=6414199&loc=d3e39622-114963 + Details
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