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Summary of significant accounting and reporting policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Equity Method Investments Below are our most significant equity method investments, other than the investments in renewable energy.

Equity method investments at Dec. 31, 2019
(dollars in millions)
Percentage ownership

Book value
 
CIBC Mellon Global Securities Services Company (“CIBC Mellon”)
50.0
%
 
$
626

Siguler Guff
20.0
%
 
$
233