Intangible Assets and Goodwill (Changes in Carrying Amount of Goodwill as Allocated to Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Beginning balance	$ 1,227	$ 1,227
Goodwill acquired and other changes during the period
Ending balance	$ 1,227	$ 1,227
Investor Services [Member]
Goodwill [Line Items]
Beginning balance	1,127	$ 1,127
Goodwill acquired and other changes during the period	(31)
Ending balance	1,096	$ 1,127
Advisor Services [Member]
Goodwill [Line Items]
Beginning balance	100	$ 100
Goodwill acquired and other changes during the period	31
Ending balance	$ 131	$ 100