Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2017

The net carrying and estimated fair values of our financial instruments by class at June 30, 2017 and December 31, 2016 were as follows:



	June 30, 2017				December 31, 2016
	Net Carrying Amount		Fair Value		Net Carrying Amount		Fair Value
	(Millions)
Long-term debt (including current maturities)	$	1,492	$	1,520	$	1,297	$	1,311
Equity swap agreement and foreign exchange forward contracts:
Asset derivative contracts (a)	4		4		—		—

(a) All derivatives are categorized within Level 2 of the fair value hierarchy.

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, 2017 (all of which mature in 2017):



		Notional Amount in Foreign Currency
		(Millions)
British pounds	—Purchase	10
Canadian dollars	—Sell	(2	)
European euro	—Purchase	4
	—Sell	(8	)
South African rand	—Sell	(8	)
U.S. dollars	—Purchase	11
	—Sell	(17	)