XML 42 R5.htm IDEA: XBRL DOCUMENT v3.20.1
CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Millions
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2020
SFr / shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
SFr / shares
CONSOLIDATED BALANCE SHEETS        
Allowance for doubtful accounts | $ $ 2      
Materials and supplies, allowance for obsolescence | $ $ 127   $ 127  
Shares, CHF par value (in Swiss francs per share) | SFr / shares   SFr 0.10   SFr 0.10
Shares, authorized 639,674,422   639,674,422  
Shares, conditionally authorized 142,365,398   142,365,398  
Shares, issued 617,970,525   617,970,525  
Shares, outstanding 614,545,303   611,871,374