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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic benefit cost (credit) for our retirement plans and postretirement plans | The components of net periodic benefit cost (credit) for our retirement plans and postretirement plans for the periods ended June 30 are as follows: Retirement Plans
(in millions) | Three Months |  | Six Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 19 |  |  | 19 |  |  | 37 |  |  | 39 |
Expected return on assets | (32 | ) |  | (31 | ) |  | (63 | ) |  | (61 | )
Amortization of actuarial loss | 4 |  |  | 4 |  |  | 9 |  |  | 8 |
Net periodic benefit cost | $ | (8 | ) |  | $ | (7 | ) |  | $ | (16 | ) |  | $ | (13 | )
Postretirement Plans
(in millions) | Three Months |  | Six Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | — |  |  | 1 |  |  | 1 |  |  | 1 |
Amortization of prior service credit / actuarial gain | (1 | ) |  | (1 | ) |  | (2 | ) |  | (1 | )
Net periodic benefit cost | $ | (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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