Variable Interest Entities (FV Option for Consolidated CLOs) (Details 3) - Consolidated investment entities [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value and unpaid principal balance of assets and liabilities carried at fair value under the fair value option
CLO debt valued using DCF model		$ 2,200	$ 2,300
Syndicated loans [Abstract]
Unpaid principal balance		2,140	2,281
Excess estimated unpaid principal over fair value		(71)	(83)
Fair value		2,069	2,198
Fair value of loans more than 90 days past due		24	8
Fair value of loans in nonaccrual status		24	8
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		35	34
Debt [Abstract]
Unpaid principal balance		2,342	2,459
Excess estimated unpaid principal over fair value		(134)	(140)
Fair value	[1]	2,208	2,319
Net investment income [Member]
Fair value and unpaid principal balance of assets and liabilities carried at fair value under the fair value option
Total net losses recognized in net investment income related to changes in the fair value of financial assets and liabilities for which the fair value options was elected		$ (5)	$ (38)	$ (35)

[1] The carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. The estimated fair value of the CLOs’ debt was $2.2 billion and $2.3 billion as of December 31, 2017 and December 31, 2016, respectively.