Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Operating revenues (includes revenue taxes of $14 and $55 for the three and six months in 2012)	$ 686		$ 375		$ 2,090		$ 1,253
Operating expenses
Cost of goods sold	240		134		959		589
Operation and maintenance	218		119		463		248
Depreciation and amortization	102		42		206		83
Taxes other than income taxes	32		12		96		25
Nicor merger expenses	3		8		13		10
Total operating expenses	595		315		1,737		955
Operating income	91		60		353		298
Other income	9		2		13		3
Interest expense, net	(45)		(32)		(92)		(61)
Earnings before income taxes	55		30		274		240
Income tax expense	20		11		100		87
Net income	35		19		174		153
Less net income attributable to the noncontrolling interest	1		1		10		11
Net income attributable to AGL Resources Inc.	$ 34		$ 18		$ 164		$ 142
Per common share data
Basic earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.28		$ 0.23		$ 1.40		$ 1.83
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.28		$ 0.23		$ 1.40		$ 1.82
Cash dividends declared per common share (in Dollars per share)	$ 0.46		$ 0.45		$ 0.82		$ 0.90
Weighted-average number of common shares outstanding
Basic (in Shares)	116.9	[1]	77.9	[1]	116.8	[1]	77.8	[1]
Diluted (in Shares)	117.2		78.5		117.1		78.3

[1] Daily weighted average shares outstanding.