v3.10.0.1
Goodwill and Intangible Assets (Intangible Assets by Business Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets      
Amortizable intangibles $ 2,158 $ 2,445 $ 2,718
Mortgage servicing rights 5 3  
Intangible assets 2,163 2,448  
IS      
Intangible Assets      
Amortizable intangibles 270 349 346
Mortgage servicing rights 2 0  
Intangible assets 272 349  
WM      
Intangible Assets      
Amortizable intangibles 1,828 2,092 2,361
Mortgage servicing rights 3 3  
Intangible assets 1,831 2,095  
IM      
Intangible Assets      
Amortizable intangibles 60 4 $ 11
Mortgage servicing rights 0 0  
Intangible assets $ 60 $ 4