Acquisitions (Tables)

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Premium over tangible net assets recorded for acquisitions based on purchase price allocations

The premium over tangible net assets recorded for acquisitions based on purchase price allocations during 2015, 2014 and 2013 was as follows:

	2015			2014			2013
In millions except weighted-average lives (years)	Weighted- Average Life	Premium Recorded		Weighted- Average Life	Premium Recorded		Weighted- Average Life	Premium Recorded
Goodwill		$	2		$	18		$	247
Amortizable intangible assets:
Patents and proprietary technology	6.4	2		15.4	8		9.8	34
Trademarks and brands	—	—		12.9	3		15.5	35
Customer lists and relationships	—	—		11.4	12		11.2	100
Other	—	—		—	—		5.0	12
Total amortizable intangible assets	6.4	2		12.9	23		11.4	181
Indefinite-lived intangible assets:
Trademarks and brands		—			—			—
Total premium recorded		$	4		$	41		$	428