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Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Note 4 - Fair Value Measurements (Tables) [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		As of December 31,
In millions		2013				2012
Long-term debt carrying amount		$	3,813			$	3,553
Long-term debt fair value (1)			3,956				4,057

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

		Fair value measurements using significant unobservable inputs - Level 3 (1)
In millions		Global hedged equity				Absolute return				Private capital				Total
Balance at December 31, 2011		$	30			$	34			$	25			$	89
Gains included in changes in net assets			3				2				3				8
Purchases			15				-				-				15
Sales			(10	)			-				(5	)			(15	)
Balance at December 31, 2012		$	38			$	36			$	23			$	97
Gains included in changes in net assets			5				3				4				12
Purchases			-				-				-				-
Sales			-				-				(5	)			(5	)
Balance at December 31, 2013		$	43			$	39			$	22			$	104
(1) There were no transfers out of Level 3, or between Level 1 and Level 2 for any of the periods presented.

Natural Gas and Interest Rate Derivatives [Member]

Note 4 - Fair Value Measurements (Tables) [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		December 31, 2013								December 31, 2012
In millions		Assets (1)				Liabilities				Assets (1)				Liabilities
Natural gas derivatives
Quoted prices in active markets (Level 1)		$	6			$	(79	)		$	8			$	(45	)
Significant other observable inputs (Level 2)			67				(79	)			96				(30	)
Netting of cash collateral			43				78				33				36
Total carrying value (2) (3)		$	116			$	(80	)		$	137			$	(39	)
Interest rate derivatives
Significant other observable inputs (Level 2)		$	-			$	-			$	3			$	-

Natural Gas Derivatives [Member]

Note 4 - Fair Value Measurements (Tables) [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

		December 31, 2013
		Pension plans (1)																				Welfare plans
In millions		Level 1				Level 2				Level 3				Total				% of total				Level 1				Level 2				Level 3				Total				% of total
Cash		$	3			$	1			$	-			$	4				-	%		$	1			$	-			$	-			$	1				1	%
Equity securities
U.S. large cap (2)			93				205				-				298				33	%			-				52				-				52				62	%
U.S. small cap (2)			72				29				-				101				11	%			-				-				-				-				-	%
International companies (3)			-				139				-				139				15	%			-				14				-				14				17	%
Emerging markets (4)			-				34				-				34				4	%			-				-				-				-				-	%
Fixed income securities
Corporate bonds (5)			-				207				-				207				23	%			-				17				-				17				20	%
Other (or gov’t/muni bonds)			-				29				-				29				3	%			-				-				-				-				-	%
Other types of investments
Global hedged equity (6)			-				-				43				43				5	%			-				-				-				-				-	%
Absolute return (7)			-				-				39				39				4	%			-				-				-				-				-	%
Private capital (8)			-				-				22				22				2	%			-				-				-				-				-	%
Total assets at fair value		$	168			$	644			$	104			$	916				100	%		$	1			$	83			$	-			$	84				100	%
% of fair value hierarchy			19	%			70	%			11	%			100	%							1	%			99	%			-	%			100	%

		December 31, 2012
		Pension plans (1)																				Welfare plans
In millions		Level 1				Level 2				Level 3				Total				% of total				Level 1				Level 2				Level 3				Total				% of total
Cash		$	14			$	2			$	-			$	16				2	%		$	1			$	-			$	-			$	1				1	%
Equity securities
U.S. large cap (2)			69				181				-				250				30	%			-				38				-				38				55	%
U.S. small cap (2)			60				22				-				82				10	%			-				-				-				-				-	%
International companies (3)			-				120				-				120				14	%			-				12				-				12				18	%
Emerging markets (4)			-				34				-				34				4	%			-				-				-				-				-	%
Fixed income securities
Corporate bonds (5)			-				216				-				216				26	%			-				18				-				18				26	%
Other (or gov’t/muni bonds)			-				30				-				30				3	%			-				-				-				-				-	%
Other types of investments
Global hedged equity (6)			-				-				38				38				4	%			-				-				-				-				-	%
Absolute return (7)			-				-				36				36				4	%			-				-				-				-				-	%
Private capital (8)			-				-				23				23				3	%			-				-				-				-				-	%
Total assets at fair value		$	143			$	605			$	97			$	845				100	%		$	1			$	68			$	-			$	69				100	%
% of fair value hierarchy			17	%			72	%			11	%			100	%							1	%			99	%			-	%			100	%

Money Market Funds [Member]

Note 4 - Fair Value Measurements (Tables) [Line Items]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

In millions		2013				2012
Money market funds (1)		$	48			$	66

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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