Capitalization (Tables)

12 Months Ended

Dec. 31, 2016

Southern Company Gas [Member]

Debt Instrument [Line Items]

Schedule of Capitalization

	Successor			Predecessor			Successor		Predecessor
	2016			2015			2016		2015
	(in millions)			(in millions)			(percent of total)		(percent of total)
Long-Term Debt:
Long-term notes payable —
1.47% to 9.10% due 2016-2046(a)	$	3,887		$	3,181
Other long-term debt —
First mortgage bonds —
2.66% to 6.58% due 2016-2038(b)	625			375
Gas facility revenue bonds —
Variable rate (1.28% at 1/1/17) due 2022-2033	200			200
Total other long-term debt	825			575
Unamortized fair value adjustment of long-term debt	578			68
Unamortized debt discount	(9		)	(4		)
Total long-term debt (annual interest requirement — $207 million)	5,281			3,820
Less amount due within one year	22			545
Long-term debt excluding amount due within one year	5,259			3,275			36.6	%	45.2	%
Common Stockholder's Equity:
Common stock — 2016: par value $0.01 per share
— 2015 par value $5 per share
Authorized — 2016: 100 million shares
— 2015: 750 million shares
Outstanding — 2016: 100 shares
— 2015: 120.4 million shares
Treasury — 2016: no shares
— 2015: 0.2 million shares
Paid-in capital	9,095			2,702
Treasury, at cost	—			(8		)
Retained earnings (accumulated deficit)	(12		)	1,421
Accumulated other comprehensive income (loss)	26			(186		)
Total common stockholder's equity	9,109			3,929			63.4		54.2
Noncontrolling interest	—			46			—		0.6
Total stockholders' equity	9,109			3,975
Total Capitalization	$	14,368		$	7,250		100.0	%	100.0	%

(a) Long-term notes payable maturities are as follows: $22 million in 2017 (7.20%); $155 million in 2018 (3.50%); $300 million in 2019 (5.25%); $330 million in 2021 (3.50% to 9.10%); and $3.1 billion in 2022-2046 (2.45% to 8.70%).

(b) First mortgage bonds maturities are as follows: $50 million in 2019 (4.70%) and $575 million in 2023-2038 (2.66% to 6.58%).