Note 5 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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

In Bcf (1)	June 30, 2014 (2)			December 31, 2013			June 30, 2013
Cash flow hedges		6			6			3
Not designated as hedges		140			183			221
Total volumes		146			189			224
Short position		(2,530	)		(2,622	)		(2,311	)
Long position		2,676			2,811			2,535
Net long position		146			189			224

Loss Recognized In Income [Table Text Block]

	Three months ended June 30,					Six months ended June 30,
In millions	2014		2013			2014		2013
Nicor Gas	$	10	$	9		$	12	$	8
Elizabethtown Gas		2		(1	)		5		(4	)

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

		June 30, 2014						December 31, 2013						June 30, 2013
In millions	Classification	Assets			Liabilities			Assets			Liabilities			Assets			Liabilities
Designated as cash flow or fair value hedges
Natural gas contracts	Current	$	2		$	(1	)	$	3		$	(1	)	$	2		$	(1	)
Not designated as hedges
Natural gas contracts	Current		702			(721	)		691			(761	)		456			(445	)
Natural gas contracts	Long-term		77			(89	)		206			(220	)		124			(139	)
Total			779			(810	)		897			(981	)		580			(584	)
Gross amount of recognized assets and liabilities (1) (2)			781			(811	)		900			(982	)		582			(585	)
Gross amounts offset in our unaudited Condensed Consolidated Statements of Financial Position (2)			(667	)		749			(781	)		902			(452	)		546
Net amounts of assets and liabilities presented in our unaudited Condensed Consolidated Statements of Financial Position (3)		$	114		$	(62	)	$	119		$	(80	)	$	130		$	(39	)

Schedule of Derivative Instruments [Table Text Block]

	Three months ended June 30,						Six months ended June 30,
In millions	2014			2013			2014			2013
Designated as cash flow or fair value hedges
Natural gas contracts - net gain reclassified from OCI into cost of goods sold	$	2		$	1		$	5		$	1
Natural gas contracts - net gain reclassified from OCI into operation and maintenance expense		-			-			1			-
Interest rate swaps - net loss reclassified from OCI into interest expense		-			-			-			(3	)
Income tax benefit		(1	)		-			(1	)		1
Net of tax		1			1			5			(1	)
Not designated as hedges (1)
Natural gas contracts - net fair value adjustments recorded in operating revenues		30			22			-			(2	)
Natural gas contracts - net fair value adjustments recorded in cost of goods sold (2)		(1	)		(1	)		1			(1	)
Income tax benefit		(11	)		(8	)		-			1
Net of tax		18			13			1			(2	)
Total gains (losses) on derivative instruments	$	19		$	14		$	6		$	(3	)