Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

The net carrying and estimated fair values of our financial instruments by class at June 30, 2016 and December 31, 2015 were as follows:



	June 30, 2016				December 31, 2015
	Net Carrying Amount		Fair Value		Net Carrying Amount		Fair Value
	(Millions)
Long-term debt (including current maturities)	$	1,284	$	1,320	$	1,125	$	1,160
Instruments with off-balance sheet risk:
Foreign exchange forward contracts:
Asset (Liability) derivative contracts	4		4		1		1

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 June 30, 2016 (all of which mature in 2016):



		Notional Amount in Foreign Currency
		(Millions)
Australian dollars	—Purchase	2
British pounds	—Purchase	20
	—Sell	(39	)
Canadian dollars	—Sell	(2	)
European euro	—Purchase	28
	—Sell	(91	)
Japanese yen	—Purchase	240
	—Sell	(401	)
Mexican peso	—Purchase	320
South African rand	—Purchase	141
	—Sell	(185	)
U.S. dollars	—Purchase	164
	—Sell	(77	)