Condensed Consolidated Statements of Changes in Equity - Piedmont - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Total Equity	Noncontrolling Interests	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings	Piedmont Total Equity	Piedmont Noncontrolling Interests
Beginning Balance (Attributable to Parent) at Dec. 31, 2021		$ 1	$ 3,265	$ 49,296			$ 1,635	$ 1,714	$ 3,349
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2021					$ 1,840					$ 0
Beginning Balance (Parent) at Dec. 31, 2021	$ 51,136					$ 3,349
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,455					323		323	323
Distributions to parent	(3,073)		(3,073)	(3,073)
Other	3		1	2	1	1				1
Ending Balance (Attributable to Parent) at Dec. 31, 2022		1	2,637	49,322			1,635	2,037	3,672
Ending Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2022					2,531					1
Ending Balance (Parent) at Dec. 31, 2022	51,853					3,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,874					379		379	379
Distributions to parent	(3,138)		(3,138)	(3,138)
Other	(2)		1	(6)	4
Ending Balance (Attributable to Parent) at Dec. 31, 2023	49,112	1	2,235	49,112		4,051	1,635	2,416	4,051
Ending Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2023	1,075				1,075	1				1
Ending Balance (Parent) at Dec. 31, 2023	50,187					4,052
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,614					413		413	413
Distributions to parent	(3,204)		(3,204)	(3,204)		(110)		(110)	(110)
Other	(2)		(2)	(2)	0	(1)		(1)	(1)
Ending Balance (Attributable to Parent) at Dec. 31, 2024	50,127	$ 1	$ 3,431	$ 50,127		4,353	$ 1,635	$ 2,718	$ 4,353
Ending Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2024	1,129				$ 1,129	1				$ 1
Ending Balance (Parent) at Dec. 31, 2024	$ 51,256					$ 4,354