Regulatory Matters - GPC Deferral of Incremental COVID-19 Costs (Details) - GEORGIA POWER CO $ in Millions	1 Months Ended
Jun. 30, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Decrease in incremental COVID-19 costs deferred	$ 20
Incremental COVID-19 costs deferred	20
Incremental COVID-19 costs deferred, bad debt costs	2
Incremental COVID-19 costs deferred, other	$ 18

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration