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Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Periodic Benefit Costs | Net periodic benefit cost consisted of the following:
|  | For the Three Months Ended March 31,
|  | Pension |  | Postretirement
|  | 2016 |  | 2015 |  | 2016 |  | 2015
| (in millions)
Service cost |  | $ | 18 |  |  | $ | 21 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost |  | 71 |  |  | 84 |  |  | 21 |  |  | 26 |
Expected return on plan assets |  | (138 | ) |  | (135 | ) |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |  |
Net loss |  | 44 |  |  | 59 |  |  | 7 |  |  | 12 |
Prior service cost (credit) |  | 1 |  |  | 2 |  |  | (10 | ) |  | (10 | )
Termination and curtailment |  | 20 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 16 |  |  | $ | 31 |  |  | $ | 22 |  |  | $ | 32 |

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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=58740216&loc=d3e1928-114920 + Details
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