CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (Parenthetical) - shares		Sep. 30, 2018	Dec. 31, 2017
Common units issued (in shares)	[1]		486,174,736
Common units outstanding (in shares)	[1]		486,174,736
Preferred units issued (in units)	[1]		20,000,000
Preferred units outstanding (in units)	[1]		20,000,000
Preferred stock, shares issued (in shares)	[1]	20,000,000
Preferred stock, shares outstanding (in shares)	[1]	20,000,000
Class A Common Stock
Common stock, shares issued (in shares)	[1]	525,593,409
Common stock, shares outstanding (in shares)	[1]	525,593,409
Class B Common Stock
Common stock, shares issued (in shares)	[1]	1
Common stock, shares outstanding (in shares)	[1]	1
Class C Common Stock
Common stock, shares issued (in shares)	[1]	303,106,993
Common stock, shares outstanding (in shares)	[1]	303,106,993

[1] See Note 1 "Organization."