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Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Allocation of Plan Assets [Table Text Block]

		December 31, 2012
		Pension plan (1)																				Other retirement plans
In millions		Level 1				Level 2				Level 3				Total				% of total				Level 1				Level 2				Level 3				Total				% of total
Cash		$	14			$	2			$	0			$	16				2	%		$	1			$	0			$	0			$	1				1	%
Equity Securities
U.S. large cap (2)			69				181				0				250				30	%			0				38				0				38				55	%
U.S. small cap (2)			60				22				0				82				10	%			0				0				0				0				0	%
International companies (3)			0				120				0				120				14	%			0				12				0				12				18	%
Emerging markets (4)			0				34				0				34				4	%			0				0				0				0				0	%
Fixed income securities
Corporate bonds (5)			0				216				0				216				26	%			0				18				0				18				26	%
Other (or gov’t/muni bonds)			0				30				0				30				3	%			0				0				0				0				0	%
Other types of investments
Global hedged equity (6)			0				0				38				38				4	%			0				0				0				0				0	%
Absolute return (7)			0				0				36				36				4	%			0				0				0				0				0	%
Private capital (8)			0				0				23				23				3	%			0				0				0				0				0	%
Total assets at fair value		$	143			$	605			$	97			$	845				100	%		$	1			$	68			$	0			$	69				100	%
% of fair value hierarchy			17	%			72	%			11	%			100	%							1	%			99	%			0	%			100	%

		December 31, 2011
		Pension plan (1)																				Other retirement plans
In millions		Level 1				Level 2				Level 3				Total				% of total				Level 1				Level 2				Level 3				Total				% of total
Cash		$	13			$	0			$	0			$	13				2	%		$	1			$	0			$	0			$	1				2	%
Equity Securities
U.S. large cap (2)			95				134				0				229				30	%			0				34				0				34				56	%
U.S. small cap (2)			53				25				0				78				10	%			0				0				0				0				0	%
International companies (3)			0				107				0				107				14	%			0				10				0				10				16	%
Emerging markets (4)			0				25				0				25				3	%			0				0				0				0				0	%
Fixed income securities
Corporate bonds (5)			0				191				0				191				25	%			0				0				0				0				0	%
Other types of investments
Other (or gov’t/muni bonds)			0				28				0				28				4	%			0				16				0				16				26	%
Global hedged equity (6)			0				0				30				30				4	%			0				0				0				0				0	%
Absolute return (7)			0				0				34				34				5	%			0				0				0				0				0	%
Private capital (8)			0				0				25				25				3	%			0				0				0				0				0	%
Total assets at fair value		$	161			$	510			$	89			$	760				100	%		$	1			$	60			$	0			$	61				100	%
% of fair value hierarchy			21	%			67	%			12	%			100	%							2	%			98	%			0	%			100	%

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

		Fair value measurements using significant unobservable inputs - Level 3 (1) December 31, 2012
In millions		Global hedged equity				Absolute return				Private capital				Total
Assets:
Beginning balance		$	30			$	34			$	25			$	89
Gains included in changes in net assets			3				2				3				8
Purchases			15				0				0				15
Sales			(10	)			0				(5	)			(15	)
Ending balance		$	38			$	36			$	23			$	97

		December 31, 2011
In millions		Global hedged equity				Absolute return				Private capital				Total
Assets:
Beginning balance		$	35			$	30			$	22			$	87
(Losses) gains included in changes in net assets			(1	)			1				5				5
Purchases			2				3				1				6
Sales			(6	)			0				(3	)			(9	)
Ending balance		$	30			$	34			$	25			$	89

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

		As of December 31,
In millions		2012				2011
Long-term debt amortized cost, including current portions of long-term debt and capital leases (1)		$	3,553			$	3,578
Long-term debt fair value (1) (2)		$	4,057			$	3,938

Natural Gas And Interest Rate Derivatives [Member]

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

		December 31, 2012								December 31, 2011
In millions		Assets (1)				Liabilities				Assets (1)				Liabilities
Natural gas derivatives
Quoted prices in active markets (Level 1)		$	8			$	(45	)		$	11			$	(145	)
Significant other observable inputs (Level 2)			96				(30	)			229				(67	)
Netting of cash collateral			33				36				32				115
Total carrying value (2) (3)		$	137			$	(39	)		$	272			$	(97	)
Interest rate derivatives
Significant other observable inputs (Level 2)		$	3			$	0			$	13			$	(13	)

Money Market Funds [Member]

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

In millions		2012				2011
Money market funds (1)		$	66			$	59

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes 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 liability.

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