[Line Items] for A schedule of the asset retirement obligations.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 25
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=116646717&loc=d3e6290-110844

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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Asset Retirement Obligations - MEC - Asset Retirement Obligations By Type (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	$ 7,369	$ 7,214
Asset retirement obligations	1,328	1,340	$ 1,341
Quad Cities Station
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	417	427
Fossil-fueled generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	396	466
Wind-powered generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	353	299
MEC
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	707	787	$ 818
MEC \| Quad Cities Station
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	417	427
MEC \| Fossil-fueled generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	76	161
MEC \| Wind-powered generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	210	197
MEC \| Solar-powered generating facilities and other
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	4	2
Quad Cities Station \| MEC
Asset Retirement Obligations By Type [Line Items]
Quad Cities Station nuclear decommissioning trust funds	664	768
Cost of removal
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	2,578	2,424
Cost of removal \| MEC
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	$ 392	$ 394