Common Equity (Common Share Activity) (Details)	9 Months Ended
Sep. 30, 2021 shares
Common Stock Oustanding [Roll Forward]
Shares outstanding, January 1, 2021 (in shares)	249,868,415
Shareowner Direct Plan (in shares)	378,823
Equity-based compensation plans (in shares)	113,549
Shares outstanding, September 30, 2021 (in shares)	250,360,787

Number of shares issued during the period as a result of an employee stock purchase plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Section S99
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Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration