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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Periodic Benefit Costs | Components of net periodic benefit cost (credit) for the three and nine months ended September 30, 2013 and 2012 are as follows:
| Pension Benefits |  | OPEB
| Three Months Ended September 30, |  | Three Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in millions)
Service cost | $ | 4 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |
Interest cost | 17 |  |  | 19 |  |  | 4 |  |  | 3 |
Expected return on plan assets | (18 | ) |  | (15 | ) |  | — |  |  | — |
Amortization of actuarial losses | 7 |  |  | 10 |  |  | 1 |  |  | 1 |
Amortization of prior service credit | 1 |  |  | — |  |  | (2 | ) |  | (3 | )
Curtailment gain | — |  |  | — |  |  | (19 | ) |  | (51 | )
| $ | 11 |  |  | $ | 21 |  |  | $ | (16 | ) |  | $ | (50 | )
| Pension Benefits |  | OPEB
| Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in millions)
Service cost | $ | 12 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |
Interest cost | 52 |  |  | 60 |  |  | 12 |  |  | 11 |
Expected return on plan assets | (53 | ) |  | (47 | ) |  | — |  |  | — |
Amortization of actuarial losses | 20 |  |  | 29 |  |  | 4 |  |  | 1 |
Amortization of prior service credit | 1 |  |  | — |  |  | (8 | ) |  | (11 | )
Settlement gain | — |  |  | (1 | ) |  | — |  |  | — |
Curtailment gain | — |  |  | — |  |  | (38 | ) |  | (51 | )
| $ | 32 |  |  | $ | 62 |  |  | $ | (30 | ) |  | $ | (50 | )

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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=28361610&loc=d3e1928-114920 + Details
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