Consolidated Statements of Cash Flows - GAS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net cash paid for capitalized interest	$ 103	$ 92	$ 81
Southern Company Gas
Net cash paid for capitalized interest	$ 10	$ 8	$ 7