Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Earnings per Share

Shares used to compute diluted earnings per share were as follows:

	Three Months Ended September 30, 2018	Three Months Ended September 30, 2017	Nine Months Ended September 30, 2018	Nine Months Ended September 30, 2017
	(in millions)
As reported shares	1,023	1,003	1,016	998
Effect of stock-based compensation	6	7	5	7
Diluted shares	1,029	1,010	1,021	1,005

Changes in Stockholders' Equity

The following table presents year-to-date changes in stockholders' equity of Southern Company:

	Number of Common Shares			Common Stockholders' Equity			Preferred and Preference Stock of Subsidiaries						Total Stockholders' Equity
	Issued	Treasury								Noncontrolling Interests(a)
	(in thousands)			(in millions)
Balance at December 31, 2017	1,008,532	(929	)	$	24,167		$	—		$	1,361		$	25,528
Consolidated net income attributable to Southern Company	—	—		1,948			—			—			1,948
Other comprehensive income	—	—		52			—			—			52
Stock issued	21,342	—		878			—			—			878
Stock-based compensation	—	—		74			—			—			74
Cash dividends on common stock	—	—		(1,805		)	—			—			(1,805		)
Contributions from noncontrolling interests	—	—		—			—			154			154
Distributions to noncontrolling interests	—	—		—			—			(87		)	(87		)
Net income attributable to noncontrolling interests	—	—		—			—			71			71
Sale of noncontrolling interests(b)	—	—		(410		)	—			1,690			1,280
Other	—	(57	)	(27		)	—			(1		)	(28		)
Balance at September 30, 2018	1,029,874	(986	)	$	24,877		$	—		$	3,188		$	28,065
Balance at December 31, 2016	991,213	(819	)	$	24,758		$	609		$	1,245		$	26,612
Consolidated net income attributable to Southern Company	—	—		347			—			—			347
Other comprehensive income (loss)	—	—		(2		)	—			—			(2		)
Stock issued	13,308	—		613			—			—			613
Stock-based compensation	—	—		97			—			—			97
Cash dividends on common stock	—	—		(1,716		)	—			—			(1,716		)
Preference stock redemption	—	—		—			(150		)	—			(150		)
Contributions from noncontrolling interests	—	—		—			—			77			77
Distributions to noncontrolling interests	—	—		—			—			(87		)	(87		)
Net income attributable to noncontrolling interests	—	—		—			—			45			45
Reclassification from redeemable noncontrolling interests	—	—		—			—			114			114
Other	—	(75	)	(15		)	3			1			(11		)
Balance at September 30, 2017	1,004,521	(894	)	$	24,082		$	462		$	1,395		$	25,939

(a) Primarily related to Southern Power and excludes redeemable noncontrolling interests. See Note 10 to the financial statements of Southern Power in Item 8 of the Form 10-K for additional information.

(b) See Note (J) under "Southern Power – Sale of Solar Facility Interests" for additional information.