Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016
Brazil Distribution [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
After-tax charge recognized upon settlement of indemnification matters	$ 113
Payment related to the sake of Brazilian pharmaceutical distribution business	$ 100
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued operations		$ 635
Total liabilities of discontinued operations		$ 660