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Redeemable Noncontrolling Interests - Narrative (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 € / shares | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($)
Noncontrolling Interest [Abstract] |  |  |
NCI, annual compensation per share (in euros per share) | € 0.83 |  |
NCI, put right redemption price per share (in euros per share) | € 22.99 |  |
NCI, put right value, interest rate spread (as a percent) |  | 5.00% |
Put right specified in domination agreement exercise period | 2 months |  |
Redeemable noncontrolling interests | $ |  | $ 1,410 | $ 1,386
Redeemable NCI, maximum redemption value | $ |  | $ 1,260 | $ 1,210
NCI, ownership percentage (as a percent) |  | 76.00% | 76.00%

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- Definition As of the reporting date, the carrying amount of 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. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form. + 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 (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&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 (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&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=27011957&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=27011957&loc=SL6540498-122764 + Details
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