Basis of Presentation and Summary of Significant Accounting Policies Assets Under Management (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets Under Management and Advisory [Abstract]
Assets under Management, Carrying Amount	$ 27,595	$ 29,907	$ 24,280

The carrying amount of assets an investment adviser manages on behalf of investors.

No definition available.

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