v3.5.0.2
CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
CONDENSED CONSOLIDATED BALANCE SHEETS    
Trade accounts receivable, allowances (in dollars) $ 122 $ 125
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 139,436,139 142,483,467
Common shares, outstanding 139,436,139 142,483,467
Treasury shares, at cost 12,882,313 9,586,083