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Cash and cash equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]        
Cash at bank available $ 1,666 $ 1,140    
Time deposits 604 2,068    
Money Market Funds 700 2,255    
Interest bearing securities 1,656 1,590    
Restricted cash, including margin deposits 552 501    
Cash and cash equivalents 5,177 7,556 $ 4,390 $ 5,090
Collateral deposits related to trading activities $ 414 $ 365