Joint Ownership Agreements (Tables)

6 Months Ended

Jun. 30, 2017

Regulated Operations [Abstract]

Equity Method Investments

Selected financial information of SNG for the three and six months ended June 30, 2017 is as follows:

Income Statement Information	Three Months Ended June 30, 2017		Six Months Ended June 30, 2017
	(in millions)
Revenues	$	143	$	298
Operating income	$	63	$	147
Net income	$	48	$	114

The carrying amounts of Southern Company Gas' equity method investments as of June 30, 2017 and December 31, 2016 and related income from those investments for the successor three and six month periods ended June 30, 2017 and the predecessor three and six month periods ended June 30, 2016 were as follows:

Balance Sheet Information	June 30, 2017		December 31, 2016
	(in millions)
SNG	$	1,405	$	1,394
Atlantic Coast Pipeline	53		33
PennEast Pipeline	45		22
Triton	43		44
Pivotal JAX LNG, LLC	32		16
Horizon Pipeline	31		30
Other	1		2
Total	$	1,610	$	1,541

Schedule of Other Nonoperating Income, by Component

	Successor		Predecessor		Successor		Predecessor
Income Statement Information	Three Months Ended June 30, 2017		Three Months Ended June 30, 2016		Six Months Ended June 30, 2017		Six Months Ended June 30, 2016
	(in millions)		(in millions)		(in millions)		(in millions)
SNG	$	24	$	—	$	58	$	—
Triton	2		1		2		1
PennEast Pipeline	1		—		4		—
Atlantic Coast Pipeline	2		—		3		—
Horizon Pipeline	—		—		1		1
Total	$	29	$	1	$	68	$	2