EQUITY - Narrative (Details) - USD ($)			12 Months Ended
	Oct. 27, 2015	Oct. 22, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 20, 2015	Sep. 10, 2013
Class of Stock [Line Items]
Accelerated share repurchase amount		$ 150,000,000
Shares of common stock available in repurchase		10,725,552
Deferred losses on derivatives qualifying as hedges			$ 119,400,000	$ 150,500,000
Treasury Stock
Class of Stock [Line Items]
Reduction of retained earnings			437,000,000	50,100,000
Treasury stock purchases			437,000,000	52,900,000	$ 88,400,000
Treasury Stock | 2013 Authorization
Class of Stock [Line Items]
Share repurchase authorization							$ 500,000,000
Treasury stock purchases			437,000,000
Treasury Stock | October 2015 Authorization
Class of Stock [Line Items]
Share repurchase authorization						$ 1,500,000,000.0
Total Equity/ (Deficit)
Class of Stock [Line Items]
Reduction of retained earnings		$ 1,000,000,000	1,000,000,000	0
Treasury stock purchases			$ 437,000,000	52,900,000	88,400,000
Number of shares of Company common stock that could be purchased with an amount of cash equal to the Repurchase Price
Class of Stock [Line Items]
Percentage of shares retired	85.00%
Interest Rate Swap
Class of Stock [Line Items]
Deferred losses on derivatives qualifying as hedges				64,400,000
Interest rate forward swaps, fair value				$ 45,000,000	$ (19,400,000)