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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Mar. 31, 2016
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued operations		$ 110	$ 635
Total liabilities of discontinued operations		$ 1	$ 660
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

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