CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, no par value (in usd per share)	$ 0	$ 0
Common stock, shares issued (in shares)	343,019,163	342,926,531
Common stock, shares outstanding (in shares)	343,019,163	342,926,531