Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Operating revenues (include revenue taxes of $24 and $74 for the three and six months in 2013 and $14 and $55 for the three and six months in 2012)	$ 904		$ 686		$ 2,613		$ 2,090
Operating expenses
Cost of goods sold	407		240		1,380		959
Operation and maintenance	233		218		492		463
Depreciation and amortization	109		102		216		206
Taxes other than income taxes	44		32		115		96
Nicor merger expenses			3	[1]			13	[1]
Total operating expenses	793		595		2,203		1,737
Gain on sale of Compass Energy	11				11
Operating income	122		91		421		353
Other income	7		9		12		13
Interest expense, net	(46)		(45)		(92)		(92)
Earnings before income taxes	83		55		341		274
Income tax expense	33		20		127		100
Net income	50		35		214		174
Less net income attributable to the noncontrolling interest	1		1		11		10
Net income attributable to AGL Resources Inc.	$ 49		$ 34		$ 203		$ 164
Per common share data
Basic earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.41		$ 0.28		$ 1.72		$ 1.40
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.41		$ 0.28		$ 1.72		$ 1.40
Cash dividends declared per common share (in Dollars per share)	$ 0.47		$ 0.46		$ 0.94		$ 0.82
Weighted average number of common shares outstanding
Basic (in Shares)	117.8	[2]	116.9	[2]	117.6	[2]	116.8	[2]
Diluted (in Shares)	118.2		117.2		117.9		117.1

[1] Transaction expenses associated with the Nicor merger are shown separately to better compare year-over-year results.

[2] Daily weighted average shares outstanding.