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Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic benefit (credit) cost for our retirement plans and postretirement plans | The components of net periodic benefit (credit) cost for our retirement plans and postretirement plans for the three months ended March 31 are as follows:
(in millions) | Retirement Plans |  | Postretirement Plans
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Interest cost | 20 |  |  | 24 |  |  | 1 |  |  | 1 |
Expected return on plan assets | (31 | ) |  | (32 | ) |  | — |  |  | — |
Amortization of actuarial loss | 4 |  |  | 5 |  |  | — |  |  | — |
Net periodic benefit (credit) cost | $ | (6 | ) |  | $ | (1 | ) |  | $ | 1 |  |  | $ | 1 |

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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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