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Related Party Transactions (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction      
Dividends paid $ 868 $ 656 $ 421
Capco Consulting Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Related Party Transaction      
Equity method investments $ 137 $ 142  
Cardinal Holdings      
Related Party Transaction      
Ownership percentage (percent) 36.00% 37.00%  
Banco Bradesco | Joint venture      
Related Party Transaction      
Ownership percentage (percent)     51.00%
Banco Bradesco      
Related Party Transaction      
Total related party revenues     $ 332
Banco Bradesco | Joint venture      
Related Party Transaction      
Dividends paid     $ 26