OWNERSHIP (Details)	Dec. 31, 2016 shares
The Vanguard Group
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	6.30%
Common stock deemed to be beneficially owned (in shares)	62,619,185
Blackrock, Inc
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	6.50%
Common stock deemed to be beneficially owned (in shares)	64,426,821
Capital Research Global Investors
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	7.80%
Common stock deemed to be beneficially owned (in shares)	77,926,159