Introduction and Basis of Presentation (Other Narratives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Cash Flows
Reduction in nonredeemable noncontrolling interests related to deconsolidation of certain legal entities associated with a real estate fund			$ 191	$ 191	$ 1,606
Real Estate Funds
Consolidated Statements of Cash Flows
Reduction in nonredeemable noncontrolling interests related to deconsolidation of certain legal entities associated with a real estate fund	$ 191
Noncash reduction in Assets	$ 169
Another Real Estate Funds
Consolidated Statements of Cash Flows
Reduction in nonredeemable noncontrolling interests related to deconsolidation of certain legal entities associated with a real estate fund		$ 1,600
Noncash reduction in Assets		$ 1,300