Components of net periodic costs. For the three and six months ended April 30, 2011 and 2010, our net pension and post retirement benefit costs were comprised of the following: | | Pensions | | | | | | | | | | U.S. Plans | | | Non-U.S. Plans | | | U.S. Post Retirement Benefit Plans | | | | Three Months Ended April 30, | | | | 2011 | | | 2010 | | | 2011 | | | 2010 | | | 2011 | | | 2010 | | | | (in millions) | | Service cost-benefits earned during the period | | $ | 11 | | | $ | 10 | | | $ | 8 | | | $ | 8 | | | $ | 1 | | | $ | 1 | | Interest cost on benefit obligation | | | 7 | | | | 7 | | | | 18 | | | | 17 | | | | 6 | | | | 7 | | Expected return on plan assets | | | (11 | ) | | | (10 | ) | | | (23 | ) | | | (21 | ) | | | (5 | ) | | | (5 | ) | Amortization and deferrals: | | | | | | | | | | | | | | | | | | | | | | | | | Actuarial loss | | | 1 | | | | 1 | | | | 9 | | | | 7 | | | | 3 | | | | 4 | | Prior service cost | | | (3 | ) | | | (3 | ) | | | - | | | | - | | | | (5 | ) | | | (4 | ) | Total net plan costs | | $ | 5 | | | $ | 5 | | | $ | 12 | | | $ | 11 | | | $ | - | | | $ | 3 | |
| | Pensions | | | | | | | | | | U.S. Plans | | | Non-U.S. Plans | | | U.S. Post Retirement Benefit Plans | | | | Six Months Ended April 30, | | | | 2011 | | | 2010 | | | 2011 | | | 2010 | | | 2011 | | | 2010 | | | | (in millions) | | Service cost-benefits earned during the period | | $ | 21 | | | $ | 20 | | | $ | 16 | | | $ | 16 | | | $ | 2 | | | $ | 2 | | Interest cost on benefit obligation | | | 14 | | | | 14 | | | | 35 | | | | 35 | | | | 13 | | | | 14 | | Expected return on plan assets | | | (22 | ) | | | (20 | ) | | | (46 | ) | | | (43 | ) | | | (10 | ) | | | (10 | ) | Amortization and deferrals: | | | | | | | | | | | | | | | | | | | | | | | | | Actuarial loss | | | 2 | | | | 3 | | | | 19 | | | | 20 | | | | 7 | | | | 8 | | Prior service cost | | | (6 | ) | | | (6 | ) | | | - | | | | - | | | | (9 | ) | | | (8 | ) | Total net plan costs | | $ | 9 | | | $ | 11 | | | $ | 24 | | | $ | 28 | | | $ | 3 | | | $ | 6 | |
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