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Employee Retirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of net periodic pension cost for the Company's defined-benefit pension plans | Net periodic pension cost for our defined-benefit pension plans was as follows, in millions:
| Three Months Ended March 31,
| 2016 |  | 2015
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 11 |  |  | 1 |  |  | 12 |  |  | 1 |
Expected return on plan assets | (10 | ) |  | — |  |  | (11 | ) |  | — |
Amortization of net loss | 4 |  |  | 1 |  |  | 4 |  |  | 1 |
Net periodic pension cost | $ | 6 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 2 |

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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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