Note 4 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Text Block]

	Three months ended June 30,						Six months ended June 30,
In millions	2013			2012			2013			2012
Nicor Gas	$	9		$	(25	)	$	8		$	(26	)
Elizabethtown Gas		(1	)		(7	)		(4	)		(16	)

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

In Bcf (1)	June 30, 2013 (2)			December 31, 2012			June 30, 2012
Hedge designation
Cash flow hedges		3			6			7
Not designated as hedges		221			96			47
Total hedges		224			102			54
Hedge position
Short position		(2,311	)		(1,955	)		(2,018	)
Long position		2,535			2,057			2,072
Net long position		224			102			54

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	Classification		June 30, 2013						December 31, 2012						June 30, 2012						December 31, 2011
In millions		(1) (2)	Assets			Liabilities			Assets			Liabilities			Assets			Liabilities			Assets			Liabilities
Designated as cash flow hedges and fair value hedges
Natural gas contracts	Current		$	2		$	(1	)	$	1		$	(2	)	$	6		$	(7	)	$	9		$	(12	)
Natural gas contracts	Long-term			-			-			3			-			-			-			-			-
Interest rate swap agreements	Long-term			-			-			-			-			17			-			13			(13	)
Total				2			(1	)		4			(2	)		23			(7	)		22			(25	)
Not designated as cash flow hedges
Natural gas contracts	Current			456			(445	)		394			(355	)		493			(489	)		706			(689	)
Natural gas contracts	Long-term			124			(139	)		45			(50	)		69			(66	)		133			(116	)
Total				580			(584	)		439			(405	)		562			(555	)		839			(805	)
Gross amount of recognized assets and liabilities				582			(585	)		443			(407	)		585			(562	)		861			(830	)
Gross amounts offset in our unaudited Condensed Consolidated Statements of Financial Position				(452	)		546			(299	)		368			(359	)		496			(573	)		720
Net amounts of assets and liabilities presented in our unaudited Condensed Consolidated Statements of Financial Position			$	130		$	(39	)	$	144		$	(39	)	$	226		$	(66	)	$	288		$	(110	)

Schedule of Derivative Instruments [Table Text Block]

	Three months ended June 30,						Six months ended June 30,
In millions	2013			2012			2013			2012
Designated as cash flow hedges
Natural gas contracts - gain reclassified from OCI into cost of goods sold	$	1		$	3		$	1		$	4
Natural gas contracts – gain reclassified from OCI into operation and maintenance expense		-			1			-			1
Natural gas contracts – loss recognized in OCI (effective portion)		-			(1	)		-			-
Interest rate swaps - ineffectiveness recorded as an offset to interest expense		-			(1	)		(3	)		(3	)
Not designated as hedges
Natural gas contracts - net fair value adjustments recorded in operating revenues (1)		22			15			(2	)		19
Natural gas contracts - net fair value adjustments recorded in cost of goods sold (2)		(1	)		(1	)		(1	)		(3	)
Total (losses) gains on derivative instruments	$	22		$	16		$	(5	)	$	18