Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Operating revenues (includes revenue taxes of $8 and $63 for the three and nine months in 2012)	$ 614		$ 295		$ 2,704		$ 1,548
Operating expenses
Cost of goods sold	215		112		1,174		701
Operation and maintenance	212		103		675		351
Depreciation and amortization	104		43		310		126
Taxes other than income taxes	27		11		123		36
Nicor merger expenses	2		2		15		12
Total operating expenses	560		271		2,297		1,226
Operating income	54		24		407		322
Other income	6		1		19		4
Interest expense, net	(45)		(31)		(137)		(92)
Earnings (loss) before income taxes	15		(6)		289		234
Income tax expense (benefit)	6		(2)		106		85
Net income (loss)	9		(4)		183		149
Less net income (loss) attributable to the noncontrolling interest	0		(1)		10		10
Net income (loss) attributable to AGL Resources Inc.	$ 9		$ (3)		$ 173		$ 139
Per common share data
Basic earnings (loss) per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.08		$ (0.04)		$ 1.48		$ 1.79
Diluted earnings (loss) per common share attributable to AGL Resources Inc. common shareholders (in Dollars per share)	$ 0.08		$ (0.04)		$ 1.48		$ 1.78
Cash dividends declared per common share (in Dollars per share)	$ 0.46		$ 0.45		$ 1.28		$ 1.35
Weighted-average number of common shares outstanding
Basic (in Shares)	117.1	[1]	78.1	[1]	116.9	[1]	77.9	[1]
Diluted (in Shares)	117.5		78.1		117.3		78.4

[1] Daily weighted average shares outstanding.