OWNERSHIP (Details)	Dec. 31, 2018 shares
The Vanguard Group
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	7.80%
Common stock deemed to be beneficially owned (in shares)	67,664,554
Blackrock, Inc
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	7.50%
Common stock deemed to be beneficially owned (in shares)	64,768,700
Capital Research Global Investors
Beneficial Ownership [Line Items]
Ownership interest (as a percent)	5.50%
Common stock deemed to be beneficially owned (in shares)	47,237,956