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Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic cost (benefit) | Net Periodic Cost (Benefit)
Three months ended March 31 |  |  |
(In millions) | 2013 |  | 2012
Pension cost (benefit) |  |  |
Service cost | $ | 3 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 30 |  |  | 34 |
Expected return on plan assets | (45 | ) |  | (43 | )
Amortization of net actuarial (gain) loss | 12 |  |  | 10 |
Net periodic pension cost (benefit) | $ | — |  |  | $ | 4 |
Postretirement cost (benefit) |  |  |
Amortization of prior service credit | $ | (4 | ) |  | $ | (4 | )
Net periodic postretirement cost (benefit) | $ | (4 | ) |  | $ | (4 | )

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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=21915506&loc=d3e1928-114920 + Details
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