Segment Information 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Revenue from the United States and international locations
Total revenue	$ 1,128	$ 1,145
United States [Member]
Revenue from the United States and international locations
Total revenue	673	683
Europe [Member]
Revenue from the United States and international locations
Total revenue	264	273
Other [Member]
Revenue from the United States and international locations
Total revenue	$ 191	$ 189

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration