Intangible Assets and Goodwill (Changes in Carrying Amount of Goodwill as Allocated to Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Goodwill [Line Items]
Beginning balance	$ 1,228	$ 1,227
Goodwill acquired and other changes during the period	(1)
Ending balance	1,227	1,227
Investor Services [Member]
Goodwill [Line Items]
Beginning balance	1,128	1,127
Goodwill acquired and other changes during the period	(1)
Ending balance	1,127	1,127
Advisor Services [Member]
Goodwill [Line Items]
Beginning balance		100	100
Ending balance	$ 100	$ 100	$ 100