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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Net periodic benefit costs |
| Pension Benefits |  | Other Post-Retirement Benefits
| Three Months Ended June 30, |  | Three Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in millions)
Service cost | $ | 5 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
Interest cost | 15 |  |  | 17 |  |  | 2 |  |  | 3 |
Expected return on plan assets | (14 | ) |  | (15 | ) |  | — |  |  | — |
Amortization of actuarial losses | 5 |  |  | 6 |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | (1 | )
| $ | 11 |  |  | $ | 12 |  |  | $ | 2 |  |  | $ | 2 |
| Pension Benefits |  | Other Post-Retirement Benefits
| Six Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in millions)
Service cost | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |
Interest cost | 31 |  |  | 34 |  |  | 5 |  |  | 6 |
Expected return on plan assets | (28 | ) |  | (29 | ) |  | — |  |  | — |
Amortization of actuarial losses | 11 |  |  | 11 |  |  | — |  |  | 1 |
Amortization of prior service credit | — |  |  | — |  |  | (1 | ) |  | (2 | )
| $ | 23 |  |  | $ | 24 |  |  | $ | 4 |  |  | $ | 5 |

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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=82843861&loc=d3e1928-114920 + Details
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