Variable Interest Entities (FV Options for consolidated CDOs) (Details 4) - Consolidated investment entities [Member] - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Syndicated loans [Abstract]
Unpaid principal balance	$ 6,320	$ 5,871
Excess estimated unpaid principal over fair value	(129)	(100)
Fair value	6,191	5,771
Fair value of loans more than 90 days past due	26	32
Fair value of loans in nonaccrual status	26	32
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both	32	25
Debt [Abstract]
Unpaid principal balance	6,739	6,248
Excess unpaid principal over fair value	(252)	(218)
Fair value	$ 6,487	$ 6,030