Consolidated Balance Sheets - SPC (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other intangible assets, amortization	$ 307	$ 328
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,500,000,000	1,500,000,000
Southern Power
Other intangible assets, amortization	$ 109	$ 89
Cumulative preferred stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Common Stockholders' Equity:
Common stock, shares authorized (in shares)	1,000,000.0	1,000,000.0
Common stock, shares outstanding (in shares)	1,000	1,000