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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2012
Employee Benefit Plans [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 months ended March 31, 2012 and 2011:
| Pension Plans |  | Other Postretirement Benefit Plans
| 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 35 |  |  | $ | 23 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost | 23 |  |  | 21 |  |  | 5 |  |  | 6 |
Expected return on plan assets | (31 | ) |  | (28 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Prior service cost (credit) | 1 |  |  | 1 |  |  | (5 | ) |  | (6 | )
Net loss | 8 |  |  | 3 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 36 |  |  | $ | 20 |  |  | $ | 3 |  |  | $ | 3 |
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. There were no significant contributions made to our pension plans during the three months ended March 31, 2012 and 2011.

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