Fair Value Measurements (Tables)

9 Months Ended

Sep. 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)	9/30/17		12/31/16		9/30/17			12/31/16			9/30/17		12/31/16		9/30/17			12/31/16
Cash equivalents	$	116	$	38	$	27		$	34		$	—	$	—	$	143		$	72
Equity mutual funds	6		5		—			—			—		—		6			5
Marketable securities:
Corporate debt securities	—		—		65			69			—		—		65			69
U.S. government and agency debt securities	—		—		10			14			—		—		10			14
Non-U.S. government debt securities	—		—		1			—			—		—		1			—
Asset-backed debt securities	—		—		12			2			—		—		12			2
Certificates of deposit	—		—		10			6			—		—		10			6
Derivative assets	—		—		3			13			—		—		3			13
Derivative liabilities	—		—		(16		)	(10		)	—		—		(16		)	(10		)