Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Financial Instruments [Abstract]

Carrying and estimated fair value

	December 31, 2011				December 31, 2010
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Millions)
Long-term debt (including current maturities)	$	1,162	$	1,200	$	1,162	$	1,201
Instruments with off-balance sheet risk:
Foreign exchange forward contracts:
Asset derivative contracts		1		1		2		2

Foreign exchange forward contracts fair value on gross basis

Fair Value of Derivative Instruments

December 31, 2011

December 31, 2010

Asset Derivatives

Liability Derivatives

Total

Asset Derivatives

Liability Derivatives

Total

(Millions)

Foreign exchange forward contracts

$1

$—

$1

$2

$—

$2

Fair Value of financial assets and liabilities on recurring basis

December 31, 2011

December 31, 2010

Level 1

Level 2

Level 3

Level 1

Level 2

Level 3

(Millions)

Financial Assets:

Foreign exchange contracts

n/a

$1

n/a

n/a

$2

n/a

Summarization for foreign currency forward purchase and sale contracts

		Notional Amount in  Foreign Currency
		(Millions)
Australian dollars	—Purchase		2
British pounds	—Purchase		4
European euro	—Sell		(56	)
Japanese Yen	—Purchase		431
South African rand	—Purchase		92
U.S. dollars	—Purchase		2
	—Sell		(47	)
Other	—Purchase		1
	—Sell		(1	)