The components of net periodic pension expense/(income) for our non-contributory qualified defined benefit pension plan and supplemental pension plans were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | ($ in millions) | October 31,
2020 | | November 2,
2019 | | October 31,
2020 | | November 2,
2019 | | Service cost | $ | 5 | | | $ | 7 | | | $ | 21 | | | $ | 21 | | | | | | | | | | | Other components of net periodic pension cost/(income): | | | | | | | | | Interest cost | 23 | | | 33 | | | 75 | | | 99 | | | Expected return on plan assets | (50) | | | (48) | | | (151) | | | (144) | | | Amortization of prior service cost | 1 | | | 2 | | | 4 | | | 6 | | | Settlement expense | 16 | | | — | | | 16 | | | — | | | Amortization of net loss | — | | | — | | | 1 | | | — | | | Curtailment loss recognized | — | | | — | | | 5 | | | — | | | Special termination benefit cost recognized | — | | | — | | | 94 | | | — | | | (10) | | | (13) | | | 44 | | | (39) | | | Net periodic pension expense/(income) | $ | (5) | | | $ | (6) | | | $ | 65 | | | $ | (18) | |
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