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Employee Benefit Plans | 6 Months Ended
--- | ---
Jun. 30, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS |
8. | EMPLOYEE BENEFIT PLANS
The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions) for the three and six months ended June 30, 2012 and 2011:
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011
Three months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 35 |  |  | $ | 22 |  |  | $ | 3 |  |  | $ | 2 |
Interest cost | 23 |  |  | 22 |  |  | 6 |  |  | 5 |
Expected return on plan assets | (31 | ) |  | (28 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service credit | — |  |  | — |  |  | (6 | ) |  | (5 | )
Net actuarial loss | 9 |  |  | 3 |  |  | — |  |  | 1 |
Net periodic benefit cost | $ | 36 |  |  | $ | 19 |  |  | $ | 3 |  |  | $ | 3 |
Six months ended June 30: |  |  |  |  |  |  |
Service cost | $ | 70 |  |  | $ | 45 |  |  | $ | 6 |  |  | $ | 5 |
Interest cost | 46 |  |  | 43 |  |  | 11 |  |  | 11 |
Expected return on plan assets | (62 | ) |  | (56 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service cost (credit) | 1 |  |  | 1 |  |  | (11 | ) |  | (11 | )
Net actuarial loss | 17 |  |  | 6 |  |  | — |  |  | 1 |
Net periodic benefit cost | $ | 72 |  |  | $ | 39 |  |  | $ | 6 |  |  | $ | 6 |
Our anticipated contributions to our pension plans during 2012 have not changed from amounts previously disclosed in our financial statements for the year ended December 31, 2011. During the six months ended June 30, 2012, we contributed approximately $13 million to our pension plans. There were no significant contributions made to our pension plans during the six months ended June 30, 2011. In July 2012, we contributed $50 million to our pension plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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