v3.10.0.1
CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Trade accounts receivable, allowances (in dollars) $ 119 $ 107
Trade accounts payable at fair value $ 574 $ 583
Convertible perpetual preference shares, par value (in dollars per share) $ 0.01 $ 0.01
Convertible perpetual preference shares, authorized (in shares) 21,000,000 21,000,000
Convertible perpetual preference shares, issued (in shares) 6,899,683 6,899,700
Convertible perpetual preference shares, outstanding (in shares) 6,899,683 6,899,700
Convertible perpetual preference shares, liquid preference (in dollars per share) $ 100 $ 100
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, authorized (in shares) 400,000,000 400,000,000
Common shares, issued (in shares) 141,065,939 140,646,829
Common shares, outstanding (in shares) 141,065,939 140,646,829
Common shares, at cost (in shares) 12,882,313 12,882,313