Summary of significant accounting and reporting policies Summary of significant accounting and reporting policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Equity Method Investments

Our most significant equity method investments are:

Equity method investments at Dec. 31, 2015
(dollars in millions)	Percentage ownership		Book value
CIBC Mellon	50.0	%		$	473
Siguler Guff	20.0	%		$	262
ConvergEx	33.9	%		$	86	(a)

(a) In addition to the common ownership interest noted, BNY Mellon also holds an interest in ConvergEx nonvoting Series B preferred units.  The book value at Dec. 31, 2015 is reflective of our combined common and preferred interests in ConvergEx.