[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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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Asset Retirement Obligations - Asset Retirement Obligation By Type (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	$ 7,214	$ 7,475
Asset retirement obligations	1,340	1,341	$ 1,272
Fossil fuel facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	466	529
Quad Cities Station
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	427	376
Wind generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	299	273
Solar generating facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	25	24
Offshore pipeline facilities
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	14	16
Other
Asset Retirement Obligations By Type [Line Items]
Asset retirement obligations	109	123
Cost of removal
Asset Retirement Obligations By Type [Line Items]
Regulatory liabilities	2,424	2,435
Quad Cities Station nuclear decommissioning trust funds
Asset Retirement Obligations By Type [Line Items]
Nuclear decommissioning trust	$ 768	$ 676