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Retirement Benefits | 6 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
RETIREMENT BENEFITS | RETIREMENT BENEFITS The following table presents the components of the net periodic benefit cost (income) incurred for Ameren’s pension and postretirement benefit plans for the three and six months ended June 30, 2022 and 2021:
| Pension Benefits |  |  | Postretirement Benefits
| Three Months |  | Six Months |  |  | Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021 |  |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost(a) | $ | 31 |  |  | $ | 34 |  |  | $ | 64 |  |  | $ | 67 |  |  |  | $ | 5 |  |  | $ | 6 |  |  | $ | 10 |  |  | $ | 12 |
Non-service cost components: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost | 41 |  |  | 38 |  |  | 81 |  |  | 76 |  |  |  | 9 |  |  | 8 |  |  | 17 |  |  | 16 |
Expected return on plan assets | (80) |  |  | (74) |  |  | (160) |  |  | (149) |  |  |  | (22) |  |  | (20) |  |  | (43) |  |  | (40) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service benefit | — |  |  | — |  |  | — |  |  | — |  |  |  | (1) |  |  | (1) |  |  | (2) |  |  | (2) |
Actuarial loss (gain) | 6 |  |  | 20 |  |  | 12 |  |  | 37 |  |  |  | (5) |  |  | (2) |  |  | (9) |  |  | (3) |
Total non-service cost components(b) | $ | (33) |  |  | $ | (16) |  |  | $ | (67) |  |  | $ | (36) |  |  |  | $ | (19) |  |  | $ | (15) |  |  | $ | (37) |  |  | $ | (29) |
Net periodic benefit cost (income)(c) | $ | (2) |  |  | $ | 18 |  |  | $ | (3) |  |  | $ | 31 |  |  |  | $ | (14) |  |  | $ | (9) |  |  | $ | (27) |  |  | $ | (17) |
(a)Service cost, net of capitalization, is reflected in “Operating Expenses – Other operations and maintenance” on Ameren’s statement of income. (b)Non-service cost components are reflected in “Other Income, Net” on Ameren’s statement of income. See Note 5 – Other Income, Net, for additional information. (c)Does not include the impact of the regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. Ameren Missouri and Ameren Illinois are responsible for their respective share of Ameren’s pension and other postretirement costs. The following table presents the respective share of net periodic pension and other postretirement benefit costs (income) incurred for the three and six months ended June 30, 2022 and 2021:
| Pension Benefits |  |  | Postretirement Benefits
| Three Months |  | Six Months |  |  | Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021 |  |  | 2022 |  | 2021 |  | 2022 |  | 2021
Ameren Missouri(a) | $ | (1) |  |  | $ | 9 |  |  | $ | (2) |  |  | $ | 15 |  |  |  | $ | (4) |  |  | $ | (1) |  |  | $ | (7) |  |  | $ | (2) |
Ameren Illinois | — |  |  | 9 |  |  | 1 |  |  | 17 |  |  |  | (10) |  |  | (8) |  |  | (20) |  |  | (15) |
Other | (1) |  |  | — |  |  | (2) |  |  | (1) |  |  |  | — |  |  | — |  |  | — |  |  | — |
Ameren(a) | $ | (2) |  |  | $ | 18 |  |  | $ | (3) |  |  | $ | 31 |  |  |  | $ | (14) |  |  | $ | (9) |  |  | $ | (27) |  |  | $ | (17) |
(a)Does not include the impact of the regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates.

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