v2.4.0.8

Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014
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Fair Value Disclosures [Abstract] |  |
Fair value of junior subordinated convertible debentures based on the trading price of the bonds | $ 2,137 | $ 2,138

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration