Sale of International Wealth Management Business and Joint Venture Investment (Details) (Japanese Brokerage Joint Venture, USD $)	12 Months Ended
Dec. 31, 2012
Japanese Brokerage Joint Venture
Schedule of Equity Method Investments [Line Items]
Gain on sale of Japanese brokerage joint venture	$ 370,000,000
Combined client balances	$ 115,000,000,000

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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