Proposed Healthcare Technology Net Asset Exchange - Carrying Amounts of Major Classes of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets held for sale	$ 1,767	$ 635
Current liabilities held for sale	604	$ 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	319
Other current assets	115
Goodwill	1,075
Intangible assets, net	95
Other noncurrent assets	163
Current assets held for sale	1,767
Deferred revenue	409
Other current liabilities	146
Other noncurrent liabilities	49
Current liabilities held for sale	$ 604