Acquisitions (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Acquisitions, net of cash acquired		$ 9	$ 23
Sage Products
Business Acquisition [Line Items]
Total consideration	$ 2,875
Goodwill, Purchase Accounting Adjustments		30
Physio Acquisition
Business Acquisition [Line Items]
Total consideration	1,299
Goodwill, Purchase Accounting Adjustments		19
Acquisitions, net of cash acquired	$ 1,299
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration		12		$ 356
Goodwill, Purchase Accounting Adjustments		$ 11