CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Common shares, shares authorized	1,400,000,000	1,400,000,000
Common shares, shares issued	330,500,000	345,000,000
Common shares, shares outstanding	330,500,000	345,000,000
Preferred shares, shares authorized	1,000,000	1,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0