Proposed Healthcare Technology Net Asset Exchange - Carrying Amounts of Major Classes of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2016	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets held for sale	$ 2,002	$ 635
Current liabilities held for sale	694	$ 660
Core MTS Businesses | Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivables, net	433
Other current assets	120
Goodwill	1,071
Intangible assets, net	92
Other noncurrent assets	176
Current assets held for sale	1,892
Deferred revenue	482
Other current liabilities	149
Other noncurrent liabilities	62
Current liabilities held for sale	$ 693