Note 2 - Significant Accounting Policies and Methods of Application (Tables)

6 Months Ended

Jun. 30, 2012

Marketable Securities [Table Text Block]

In millions	June 30, 2012		December 31, 2011		June 30, 2011
Money market funds	$	76	$	59	$	0
Corporate bonds		5		6		0
Other investments		6		7		0
Total	$	87	$	72	$	0

In millions	June 30, 2012		December 31, 2011		June 30, 2011
Cash and cash equivalents	$	17	$	9	$	0
Short-term investments		61		53		0
Other long-term assets and other deferred debits		9		10		0
Total	$	87	$	72	$	0

Investments Classified by Contractual Maturity Date [Table Text Block]

	Years to maturity
In millions	Less than 1 year		1-5 years		5-10 years		Total
Held-to-maturity investments	$	2	$	5	$	0	$	7

	Three months ended June 30,				Six months ended June 30,
In millions	2012		2011		2012		2011
Retail operations	$	0	$	0	$	3	$	0
Wholesale services		0		0		18		0
Midstream operations		0		0		1		0

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three months ended June 30,				Six months ended June 30,
In millions (except per share amounts)	2012		2011		2012		2011
Net income attributable to AGL Resources Inc.	$	34	$	18	$	164	$	142
Denominator:
Basic weighted average number of shares outstanding (1)		116.9		77.9		116.8		77.8
Effect of dilutive securities		0.3		0.6		0.3		0.5
Diluted weighted average number of shares outstanding		117.2		78.5		117.1		78.3
Basic and diluted earnings per share
Basic	$	0.28	$	0.23	$	1.40	$	1.83
Diluted	$	0.28	$	0.23	$	1.40	$	1.82
(1) Daily weighted average shares outstanding.

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	June 30,
In millions	2012		2011
Three months ended		0.6		0.0
Six months ended		0.0		0.0

Schedule of Regulatory Assets [Table Text Block]

In millions	June 30, 2012 (1)		December 31, 2011 (2)		June 30, 2011
Regulatory assets - current
Recoverable regulatory infrastructure program costs	$	47	$	48	$	47
Recoverable retirement benefit costs		27		29		0
Recoverable ERC		30		7		7
Other		42		47		17
Total regulatory assets - current		146		131		71
Regulatory assets - long-term
Recoverable ERC		428		351		215
Recoverable regulatory infrastructure program costs		313		305		281
Recoverable retirement benefit costs		232		262		9
Long-term debt fair-value adjustment		94		99		0
Unamortized losses on reacquired debt		20		21		10
Other		41		41		28
Total regulatory assets - long-term		1,128		1,079		543
Total regulatory assets	$	1,274	$	1,210	$	614

Schedule of Regulatory Liabilities [Table Text Block]

Regulatory liabilities - current
Accrued natural gas costs	$	73	$	53	$	49
Bad debt rider		31		30		0
Accumulated removal costs		14		14		0
Other		19		15		17
Total regulatory liabilities - current		137		112		66
Regulatory liabilities - long-term
Accumulated removal costs		1,366		1,321		253
Unamortized investment tax credit		31		32		11
Regulatory income tax liability		25		27		15
Bad debt rider		18		14		0
Other		13		11		17
Total regulatory liabilities - long-term		1,453		1,405		296
Total regulatory liabilities	$	1,590	$	1,517	$	362