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CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Millions
Sep. 30, 2018
SFr / shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2017
SFr / shares
Dec. 31, 2017
USD ($)
shares
Materials and supplies, allowance for obsolescence | $   $ 139   $ 141
Shares, CHF par value (in Swiss francs per share) | SFr / shares SFr 0.10   SFr 0.10  
Shares, authorized   490,584,698   417,060,033
Shares, conditionally authorized   143,754,927   143,783,041
Shares, issued   462,880,809   394,801,990
Shares, outstanding   461,903,386   391,237,308
Maximum        
Allowance for doubtful accounts | $   $ 1   $ 1