v2.3.0.11
CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data
Jun. 30, 2011
Dec. 31, 2010
Trade accounts receivable, allowance (in dollars) $ 184 $ 177
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, authorized 400,000,000 400,000,000
Common shares, issued 147,344,609 146,635,083
Convertible perpetual preference shares
   
Preference shares, par value (in dollars per share) $ 0.01 $ 0.01
Preference shares, authorized 6,900,000 6,900,000
Preference shares, issued 6,900,000 6,900,000
Preference shares, outstanding 6,900,000 6,900,000
Preference shares, liquidation preference (in dollars per share) $ 100 $ 100