Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

Our assets and liabilities measured at fair value on a recurring basis were as follows:

	Level 1				Level 2						Level 3				Total
(millions)	6/30/17		12/31/16		6/30/17			12/31/16			6/30/17		12/31/16		6/30/17			12/31/16
Cash equivalents	$	36	$	38	$	30		$	34		$	—	$	—	$	66		$	72
Equity mutual funds	5		5		—			—			—		—		5			5
Marketable securities:
Corporate debt securities	—		—		62			69			—		—		62			69
U.S. government and agency debt securities	—		—		10			14			—		—		10			14
Non-U.S. government debt securities	—		—		1			—			—		—		1			—
Asset-backed debt securities	—		—		8			2			—		—		8			2
Certificates of deposit	—		—		11			6			—		—		11			6
Derivative assets	—		—		4			13			—		—		4			13
Derivative liabilities	—		—		(14		)	(10		)	—		—		(14		)	(10		)