Introduction - Depreciation and Amortization (Details)		12 Months Ended
Jan. 01, 2022	Dec. 31, 2021
Maximum \| Wind Generating Facility \| SOUTHERN POWER CO
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	35 years	30 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration