Variable Interest Entities (Consolidating Entities) (Details 5) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Variable interest entity, not primary beneficiary [Member] | Sponsored hedge funds and private equity funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Variable interest entity, nonconsolidated, carrying amount, assets	$ 85	$ 89
Variable interest entity, not primary beneficiary [Member] | Affordable housing partnerships [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Variable interest entity, nonconsolidated, carrying amount, assets	$ 517	$ 504
Consolidated investment entities [Member] | CLO [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of variable interest or voting rights entities consolidated	2	3
Value of variable interest or voting rights entities consolidated	$ 1,300	$ 1,700
Number of variable interest or voting rights entities liquidated	1	1
Value of variable interest or voting rights entities liquidated	$ 203	$ 300
Consolidated investment entities [Member] | Property Fund [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Number of variable interest or voting rights entities consolidated	3	2
Value of variable interest or voting rights entities consolidated	$ 452	$ 260