OWNERSHIP (Details)	Dec. 31, 2015 shares
The Vanguard Group
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	5.50%
Common stock deemed to be beneficially owned (in shares)	67,605,730
Blackrock, Inc
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	6.50%
Common stock deemed to be beneficially owned (in shares)	80,762,613