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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Periodic Benefit Costs | Components of net periodic benefit cost for the three and six months ended June 30, 2016 and 2015 are as follows:
| Pension Benefits |  | OPEB
| Three Months Ended June 30, |  | Three Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in millions)
Service cost | $ | 4 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Interest cost | 17 |  |  | 16 |  |  | 3 |  |  | 4 |
Expected return on plan assets | (15 | ) |  | (18 | ) |  | — |  |  | — |
Amortization of actuarial losses | 6 |  |  | 7 |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | (1 | ) |  | (1 | )
| $ | 12 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 3 |
| Pension Benefits |  | OPEB
| Six Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| (in millions)
Service cost | $ | 8 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |
Interest cost | 34 |  |  | 32 |  |  | 6 |  |  | 7 |
Expected return on plan assets | (29 | ) |  | (35 | ) |  | — |  |  | — |
Amortization of actuarial losses | 11 |  |  | 14 |  |  | 1 |  |  | 2 |
Amortization of prior service credit | — |  |  | — |  |  | (2 | ) |  | (2 | )
| $ | 24 |  |  | $ | 21 |  |  | $ | 5 |  |  | $ | 7 |

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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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