Divestiture (Details) - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 618	$ 0
Liabilities held for sale	$ 202	$ 0
Respiratory Solutions | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, percent of business sold	50.10%
Disposal Group, percent of business retained	49.90%
Assets held for sale	$ 588
Liabilities held for sale	$ 202