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Consolidated Balance Sheets (Parenthetical)
shares in Millions, $ in Millions
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2020
SFr / shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
SFr / shares
Allowance for credit losses | $ $ 127   $ 135  
Common stock, par or stated value per share | SFr / shares   SFr 0.10   SFr 0.10
Ordinary shares, authorized 2,495   2,495  
Ordinary shares, issued 1,201   1,198  
Treasury shares 106   106