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Defined Benefit Pension and Other Postretirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Costs | The following summarizes the components of net periodic benefit costs:
| Three Months Ended March 31,
| Pension Benefits |  | Other Benefits
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 31 |  |  | $ | 28 |  |  | $ | 7 |  |  | $ | 8 |
Interest cost | 19 |  |  | 19 |  |  | 8 |  |  | 9 |
Expected return on plan assets | (26 | ) |  | (25 | ) |  | — |  |  | — |
Amortization – prior service credit | (10 | ) |  | (11 | ) |  | (1 | ) |  | (1 | )
– actuarial loss | 9 |  |  | 10 |  |  | — |  |  | 1 |
– settlement loss | — |  |  | 1 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 23 |  |  | $ | 22 |  |  | $ | 14 |  |  | $ | 17 |

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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=65897934&loc=d3e1928-114920 + Details
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