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Redeemable Noncontrolling Interests and Noncontrolling Interests - Narrative (Details) | 12 Months Ended |
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Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 € / shares | Dec. 02, 2014 € / shares
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interests | $ 178,000,000 | $ 84,000,000 |  |  |
Net income attributable to noncontrolling interests | 83,000,000 | 52,000,000 | $ 67,000,000 |  |
Celesio |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Annual recurring compensation (in euro per share) | € / shares |  |  |  |  | € 0.83
Dividends paid (in euro per share) | € / shares |  |  |  | € 0.83 |
Put right (in dollars per share) | € / shares |  |  |  |  | € 22.99
Percentage points |  |  |  |  | 5.00%
Total attribution of net income to the noncontrolling shareholders | 44,000,000 | 44,000,000 | 62,000,000 |  |
Carrying value of noncontrolling interests | 1,330,000,000 | 1,410,000,000 | 1,500,000,000 |  |
Maximum redemption value | $ 1,206,000,000.000 | $ 1,280,000,000.00 |  |  |
Percentage of outstanding common shares | 76.00% | 76.00% |  |  |
Vantage |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Fair value of noncontrolling interest | $ 89,000,000 |  |  |  |
Vantage and ClarusOne Sourcing Services LLC |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net income attributable to noncontrolling interests | $ 39,000,000 | $ 8,000,000 | $ 5,000,000 |  |

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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