Segment and Related Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting Information [Line Items]

Financial data for business segments

Financial data for business segments and products and services for the years ended December 31, 2016, 2015, and 2014 was as follows:

	Electric Utilities
	Traditional Electric Operating Companies		Southern Power			Eliminations			Total		Southern Company Gas		All Other			Eliminations			Consolidated
	(in millions)
2016
Operating revenues	$	16,803	$	1,577		$	(439	)	$	17,941	$	1,652	$	463		$	(160	)	$	19,896
Depreciation and amortization	1,881		352			—			2,233		238		31			—			2,502
Interest income	6		7			—			13		2		20			(15		)	20
Earnings from equity method investments	2		—			—			2		60		(3		)	—			59
Interest expense	814		117			—			931		81		317			(12		)	1,317
Income taxes	1,286		(195		)	—			1,091		76		(216		)	—			951
Segment net income (loss)(a) (b)	2,233		338			—			2,571		114		(230		)	(7		)	2,448
Total assets	72,141		15,169			(316		)	86,994		21,853		2,474			(1,624		)	109,697
Gross property additions	4,852		2,114			—			6,966		618		41			(1		)	7,624
2015
Operating revenues	$	16,491	$	1,390		$	(439	)	$	17,442	$	—	$	152		$	(105	)	$	17,489
Depreciation and amortization	1,772		248			—			2,020		—		14			—			2,034
Interest income	19		2			1			22		—		6			(5		)	23
Earnings from equity method investments	1		—			—			1		—		(1		)	—			—
Interest expense	697		77			—			774		—		69			(3		)	840
Income taxes	1,305		21			—			1,326		—		(132		)	—			1,194
Segment net income (loss)(a) (b)	2,186		215			—			2,401		—		(32		)	(2		)	2,367
Total assets	69,052		8,905			(397		)	77,560		—		1,819			(1,061		)	78,318
Gross property additions	5,124		1,005			—			6,129		—		40			—			6,169
2014
Operating revenues	$	17,354	$	1,501		$	(449	)	$	18,406	$	—	$	159		$	(98	)	$	18,467
Depreciation and amortization	1,709		220			—			1,929		—		16			—			1,945
Interest income	17		1			—			18		—		3			(2		)	19
Earnings from equity method investments	1		—			—			1		—		(1		)	—			—
Interest expense	705		89			—			794		—		43			(2		)	835
Income taxes	1,056		(3		)	—			1,053		—		(76		)	—			977
Segment net income (loss)(a) (b)	1,797		172			—			1,969		—		(3		)	(3		)	1,963
Total assets(c)	64,300		5,233			(131		)	69,402		—		1,143			(312		)	70,233
Gross property additions	5,568		942			—			6,510		—		11			1			6,522

(a) Attributable to Southern Company.

(b) Segment net income (loss) for the traditional electric operating companies includes pre-tax charges for estimated probable losses on the Kemper IGCC of $428 million ($264 million after tax) in 2016, $365 million ($226 million after tax) in 2015, and $868 million ($536 million after tax) in 2014. See Note 3 under "Integrated Coal Gasification Combined Cycle – Kemper IGCC Schedule and Cost Estimate" for additional information.

(c) Net of $202 million of unamortized debt issuance costs as of December 31, 2014.Also net of $488 million of deferred tax assets as of December 31, 2014.

Financial data for products and services

Products and Services

Electric Utilities' Revenues
Year	Retail		Wholesale		Other		Total
	(in millions)
2016	$	15,234	$	1,926	$	781	$	17,941
2015	14,987		1,798		657		17,442
2014	15,550		2,184		672		18,406

Southern Company Gas' Revenues
Year	Gas Distribution Operations		Gas Marketing Services		All Other		Total
	(in millions)
2016	$	1,266	$	354	$	32	$	1,652

Southern Company Gas [Member]

Segment Reporting Information [Line Items]

Financial data for business segments

Financial data for business segments for the successor period of July 1, 2016 through December 31, 2016 and for the predecessor periods of January 1, 2016 through June 30, 2016 and the years ended December 31, 2015 and 2014 were as follows:

	Gas Distribution Operations			Gas Marketing Services			Wholesale Gas Services(*)			Gas Midstream Operations			Total			All Other			Eliminations			Consolidated
	(in millions)
Successor – July 1, 2016 through December 31, 2016
Operating revenues	$	1,342		$	354		$	24		$	31		$	1,751		$	3		$	(102	)	$	1,652
Depreciation and amortization	185			35			1			9			230			8			—			238
Earnings from equity method investments	—			—			—			58			58			2			—			60
Interest expense	(105		)	(1		)	(3		)	(16		)	(125		)	44			—			(81		)
Income taxes	51			7			(3		)	16			71			5			—			76
Segment net income (loss)	77			19			—			20			116			(2		)	—			114
Gross property additions	561			5			1			54			621			11			—			632
Successor – Total assets at December 31, 2016	19,453			2,084			1,127			2,211			24,875			11,145			(14,167		)	21,853

(*) The revenues for wholesale gas services are netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table.

	Gas Distribution Operations		Gas Marketing Services		Wholesale Gas Services(*)			Gas Midstream Operations			Total		All Other			Eliminations			Consolidated
	(in millions)
Predecessor – January 1, 2016 through June 30, 2016
Operating revenues	$	1,575	$	435	$	(32	)	$	25		$	2,003	$	4		$	(102	)	$	1,905
Depreciation and  amortization	178		11		1			9			199		7			—			206
EBIT	353		109		(68		)	(6		)	388		(60		)	—			328
Gross property additions	484		4		1			43			532		16			—			548
Predecessor – Year Ended December 31, 2015
Operating revenues	$	3,049	$	835	$	202		$	55		$	4,141	$	11		$	(211	)	$	3,941
Depreciation and  amortization	336		25		1			18			380		17			—			397
EBIT	581		152		110			(23		)	820		(59		)	—			761
Gross property additions	957		7		2			27			993		34			—			1,027
Predecessor – Total assets at December 31, 2015	12,519		686		935			692			14,832		9,662			(9,740		)	14,754
Predecessor – Year Ended December 31, 2014
Operating revenues	$	4,001	$	994	$	578		$	88		5,661		$	7		$	(283	)	$	5,385
Depreciation and  amortization	317		28		1			18			364		16			—			380
EBIT	582		132		425			(17		)	1,122		(10		)	—			1,112
Gross property additions	715		11		2			15			743		26			—			769
Predecessor – Total assets at December 31, 2014	12,038		670		1,402			694			14,804		9,705			(9,647		)	14,862

(*) The revenues for wholesale gas services are netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table.

	Third Party Gross Revenues		Intercompany Revenues		Total Gross Revenues		Less Gross Gas Costs		Operating Revenues
	(in millions)
Successor – July 1, 2016 through December 31, 2016	$	5,807	$	333	$	6,140	$	6,116	$	24
	(in millions)
Predecessor – January 1, 2016 through June 30, 2016	$	2,500	$	143	$	2,643	$	2,675	$	(32	)
Year Ended December 31, 2015	6,286		408		6,694		6,492		202
Year Ended December 31, 2014	10,709		718		11,427		10,849		578