Company Operations by Business Unit - Geographic Financial Information - Long-lived Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
United States	$ 880	$ 900	$ 825
UNITED STATES
Segment Reporting Information [Line Items]
United States	523	549	506
Other Countries [Member]
Segment Reporting Information [Line Items]
United States	$ 357	$ 351	$ 319

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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