DERIVATIVE INSTRUMENTS (Schedule of Interest Rate Swap Derivatives) (Details) - Designated as Hedging Instrument - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Swap
Derivative [Line Items]
Current Notional Amount	$ 1,500,000,000	$ 1,100,000,000
Cash Flow Hedging
Derivative [Line Items]
Estimated Fair Value	619,000,000	592,000,000
Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Current Notional Amount	1,475,000,000	1,050,000,000
Cash Flow Hedging | 3-Month USD LIBOR | Interest Rate Swap Designated June 22, 2016 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 50,000,000	$ 50,000,000
Fixed Interest Rate	1.062%	1.062%
Estimated Fair Value	$ 410,000,000	$ 675,000,000
Cash Flow Hedging | 3-Month USD LIBOR | Interest Rate Swap Designated June 22, 2016 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 50,000,000	$ 50,000,000
Fixed Interest Rate	1.062%	1.062%
Estimated Fair Value	$ 415,000,000	$ 672,000,000
Cash Flow Hedging | 3-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 50,000,000	$ 50,000,000
Fixed Interest Rate	1.834%	1.834%
Estimated Fair Value	$ 619,000,000	$ 318,000,000
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated July 12, 2016
Derivative [Line Items]
Current Notional Amount	$ 50,000,000	$ 50,000,000
Fixed Interest Rate	0.825%	0.825%
Estimated Fair Value	$ 418,000,000	$ 779,000,000
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated February 6, 2017 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 100,000,000	$ 100,000,000
Fixed Interest Rate	1.652%	1.652%
Estimated Fair Value	$ 1,287,000,000	$ 858,000,000
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated March 27, 2017
Derivative [Line Items]
Current Notional Amount	$ 100,000,000	$ 100,000,000
Fixed Interest Rate	1.971%	1.971%
Estimated Fair Value	$ 1,246,000,000	$ 337,000,000
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 150,000,000	$ 150,000,000
Fixed Interest Rate	2.201%	2.201%
Estimated Fair Value	$ 1,491,000,000	$ (455,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 150,000,000	$ 150,000,000
Fixed Interest Rate	2.201%	2.201%
Estimated Fair Value	$ 1,460,000,000	$ (434,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 3
Derivative [Line Items]
Current Notional Amount	$ 100,000,000	$ 100,000,000
Fixed Interest Rate	2.423%	2.423%
Estimated Fair Value	$ 418,000,000	$ (684,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 4
Derivative [Line Items]
Current Notional Amount	$ 50,000,000	$ 50,000,000
Fixed Interest Rate	2.423%	2.423%
Estimated Fair Value	$ 162,000,000	$ (255,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 13, 2017 Tranche 5
Derivative [Line Items]
Current Notional Amount	$ 200,000,000	$ 200,000,000
Fixed Interest Rate	2.313%	2.313%
Estimated Fair Value	$ 2,076,000,000	$ (1,219,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.22%
Estimated Fair Value	$ (2,594,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.199%
Estimated Fair Value	$ (2,551,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated October 10, 2018 Tranche 3
Derivative [Line Items]
Current Notional Amount	$ 75,000,000
Fixed Interest Rate	3.209%
Estimated Fair Value	$ (2,568,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 1
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	2.885%
Estimated Fair Value	$ (797,000,000)
Cash Flow Hedging | 1-Month USD LIBOR | Interest Rate Swap Designated December 18, 2018 Tranche 2
Derivative [Line Items]
Current Notional Amount	$ 100,000,000
Fixed Interest Rate	2.867%
Estimated Fair Value	$ (873,000,000)