v3.3.1.900
CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS    
Trade accounts receivable, allowances (in dollars) $ 125 $ 121
Convertible perpetual preference shares, par value (in dollars per share) $ 0.01 $ 0.01
Convertible perpetual preference shares, authorized 6,900,000 6,900,000
Convertible perpetual preference shares, issued 6,900,000 6,900,000
Convertible perpetual preference shares, outstanding 6,900,000 6,900,000
Convertible perpetual preference shares, liquidation preference (in dollars per share) $ 100 $ 100
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, authorized 400,000,000 400,000,000
Common shares, issued 142,483,467 145,703,198
Common shares, outstanding 142,483,467 145,703,198
Treasury shares 9,586,083 5,714,273