Goodwill Capitalized Software and Other Intangible Assets 4 (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Goodwill, Capitalized Software and Other Intangible Assets (Textual) [Abstract]
Gross carrying amount of capitalized software and other intangible assets	$ 7,763	$ 7,417
Accumulated amortization for capitalized software and other intangible assets	6,337	6,133
Fully amortized intangible assets	5,686	5,290
Purchased software products [Member]
Goodwill, Capitalized Software and Other Intangible Assets (Textual) [Abstract]
Fully amortized intangible assets	4,731	4,662
Internally developed software products [Member]
Goodwill, Capitalized Software and Other Intangible Assets (Textual) [Abstract]
Fully amortized intangible assets	552	508
Other intangible assets subject to amortization [Member]
Goodwill, Capitalized Software and Other Intangible Assets (Textual) [Abstract]
Fully amortized intangible assets	$ 403	$ 120

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant