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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Information [Line Items]
Pretax charges (credits) related to last-in-first-out method of accounting for inventory									$ (7)	$ 244	$ 337
Pre-tax gain on sale of business									(94)	103	0
Goodwill impairment charge									290	0	$ 0
Pre-tax charge					$ 229				14	229
Cost of Sales
Quarterly Financial Information [Line Items]
Pre-tax charge					26					26
Operating Expenses
Quarterly Financial Information [Line Items]
Pre-tax charge					203					203
Distribution Solutions
Quarterly Financial Information [Line Items]
Goodwill impairment charge									0
Technology Solutions
Quarterly Financial Information [Line Items]
Goodwill impairment charge									290
Operating Segments | Distribution Solutions
Quarterly Financial Information [Line Items]
Pretax charges (credits) related to last-in-first-out method of accounting for inventory	$ 144	$ (155)	$ (43)	$ 47	29	$ 33	$ 91	$ 91
Net cash proceeds		$ 2		$ 142		$ 17		59	144	76
Pre-tax charge					161				19	161
Operating Segments | Distribution Solutions | ZEE Medical Business
Quarterly Financial Information [Line Items]
Pre-tax gain on sale of business							52			52
Gain from sale of business, after tax							$ 29
Operating Segments | Distribution Solutions | Cost of Sales
Quarterly Financial Information [Line Items]
Pre-tax charge										5
Operating Segments | Distribution Solutions | Operating Expenses
Quarterly Financial Information [Line Items]
Pre-tax charge										156
Operating Segments | Technology Solutions
Quarterly Financial Information [Line Items]
Goodwill impairment charge			$ 290
Pre-tax charge					$ 51				(10)	51
Operating Segments | Technology Solutions | Core MTS Businesses
Quarterly Financial Information [Line Items]
Pre-tax gain on sale of business	3,947								$ 3,947
Gain from sale of business, after tax	$ 3,018
Operating Segments | Technology Solutions | Nurse Triage
Quarterly Financial Information [Line Items]
Pre-tax gain on sale of business								51		51
Gain from sale of business, after tax								$ 38
Operating Segments | Technology Solutions | Cost of Sales
Quarterly Financial Information [Line Items]
Pre-tax charge										21
Operating Segments | Technology Solutions | Operating Expenses
Quarterly Financial Information [Line Items]
Pre-tax charge										$ 30

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