GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Jun. 30, 2015
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Goodwill, Balance at beginning of period			$ 6,032	$ 5,649	$ 5,649
Goodwill acquired during the period			23		383
Reclassification to assets held for sale			(160)		0
Goodwill, Balance at end of period	$ 5,895		5,895		6,032
Intangible assets, Cost	1,390		1,390		1,487
Intangible assets, Accumulated Amortization	(386)		(386)		(416)
Amortizing intangible assets, Net	1,004		1,004		1,071
Amortization expense	20	$ 24	61	$ 71
Remainder of 2015	19		19
Future Amortization Expense, 2016	72		72
Future Amortization Expense, 2017	68		68
Future Amortization Expense, 2018	63		63
Future Amortization Expense, 2019	63		63
Future Amortization Expense, 2020	63		63
Future Amortization Expense, Thereafter	420		420
Future Amortization Expense, Total	768		768
Held-for-sale [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	48		48
Intangible assets, Accumulated Amortization	(32)		(32)
Amortizing intangible assets, Net	16		16
Intangible Assets Not Subject to Amortization - Tradenames [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	235		235		244
Amortizing intangible assets, Net	235		235		244
Intangible Assets Not Subject to Amortization - Other [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	1		1		1
Amortizing intangible assets, Net	1		$ 1		1
Customer-related intangibles [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			19 years
Intangible assets, Cost	926		$ 926		929
Intangible assets, Accumulated Amortization	(283)		(283)		(259)
Amortizing intangible assets, Net	643		$ 643		670
Noncompete Agreements [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			5 years
Intangible assets, Cost	6		$ 6		43
Intangible assets, Accumulated Amortization	(3)		(3)		(37)
Amortizing intangible assets, Net	3		$ 3		6
Technology [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			14 years
Intangible assets, Cost	117		$ 117		118
Intangible assets, Accumulated Amortization	(45)		(45)		(38)
Amortizing intangible assets, Net	72		$ 72		80
Other [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			9 years
Intangible assets, Cost	105		$ 105		152
Intangible assets, Accumulated Amortization	(55)		(55)		(82)
Amortizing intangible assets, Net	50		$ 50		70
Total Amortizing Intangible Assets [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period			17 years
Intangible assets, Cost	1,154		$ 1,154		1,242
Intangible assets, Accumulated Amortization	(386)		(386)		(416)
Amortizing intangible assets, Net	$ 768		$ 768		826
Noncompete Agreements, Fully Amortized [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost						$ 37
Intangible assets, Accumulated Amortization						$ (37)
Solstas, Summit Health, and Steward [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets					$ 270