Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

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Carrying and Estimated Fair Value

The carrying and estimated fair values of our financial instruments by class at December 31, 2014 and 2013 were as follows:

	December 31, 2014				December 31, 2013
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(Millions)
Long-term debt (including current maturities)	$	1,071	$	1,106	$	1,021	$	1,089
Instruments with off-balance sheet risk:
Foreign exchange forward contracts:
Asset derivative contracts	—		—		—		—

Foreign Exchange Forward Contracts Fair Value on Gross Basis

2013.

Fair Value of Financial Assets on Recurring Basis

.

Fair Value Hierarchy

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Summarization for Foreign Currency Forward Purchase and Sale Contracts

The following table summarizes by major currency the notional amounts for foreign currency forward purchase and sale contracts as of December 31, 2014 (all of which mature in 2015):

		Notional Amount in Foreign Currency
		(Millions)
Australian dollars	—Purchase	3
British pounds	—Purchase	1
Canadian dollars	—Sell	(2	)
European euro	—Purchase	1
	—Sell	(4	)
Japanese yen	—Sell	(1,268	)
South African rand	—Purchase	112
U.S. dollars	—Purchase	14
	—Sell	(10	)