Principles Of Consolidation And Other Matters (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Restricted Cash and Cash Equivalents	$ 240		$ 240
Equity method gains (losses)		4	20	24
Performance Fees	15		21
Deferred Revenue, Revenue Recognized			32
Effective tax rate	28.90%	29.80%	29.50%	30.00%
Gross unrecognized tax benefits	120		120		117
Minimum [Member] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible Estimated Range of Change Upper Limit [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	0		0
Maximum [Member] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible Estimated Range of Change Upper Limit [Member]
Projection of unrecognized tax benefit in twelve months, upper bound	$ 22		$ 22