The components of net periodic benefit cost for defined benefit plans are as follows: | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Retiree Benefits | | Three Months Ended September 30 | | Three Months Ended September 30 | Amounts in millions | 2011 | | 2010 | | 2011 | | 2010 | Service cost | $ | 67 |
| | $ | 62 |
| | $ | 36 |
| | $ | 35 |
| Interest cost | 157 |
| | 140 |
| | 69 |
| | 65 |
| Expected return on plan assets | (146 | ) | | (119 | ) | | (108 | ) | | (108 | ) | Amortization of deferred amounts | 6 |
| | 4 |
| | (5 | ) | | (5 | ) | Recognized net actuarial loss | 26 |
| | 37 |
| | 25 |
| | 24 |
| Gross benefit cost (credit) | 110 |
| | 124 |
| | 17 |
| | 11 |
| Dividends on ESOP preferred stock | — |
| | — |
| | (19 | ) | | (20 | ) | Net periodic benefit cost (credit) | $ | 110 |
| | $ | 124 |
| | $ | (2 | ) | | $ | (9 | ) |
|