XML 68 R29.htm IDEA: XBRL DOCUMENT
v3.22.2

Retirement Benefits (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2022
Retirement Benefits [Abstract] |
Components Of Net Periodic Benefit Cost | 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.
Summary Of Benefit Plan Costs Incurred | 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.

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration