GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
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	1		383
Reclassification to assets held for sale	(47)		0
Goodwill, Balance at end of period	5,986		6,032
Intangible assets, Cost	1,469		1,487
Intangible assets, Accumulated Amortization	(428)		(416)
Amortizing intangible assets, Net	1,041		1,071
Amortization expense	21	22
Remainder of 2015	59
Future Amortization Expense, 2016	71
Future Amortization Expense, 2017	67
Future Amortization Expense, 2018	63
Future Amortization Expense, 2019	62
Future Amortization Expense, 2020	62
Future Amortization Expense, Thereafter	412
Future Amortization Expense, Total	796
Intangible Assets Not Subject to Amortization - Tradenames [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	244		244
Amortizing intangible assets, Net	244		244
Intangible Assets Not Subject to Amortization - Other [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Cost	1		1
Amortizing intangible assets, Net	1		1
Customer-related intangibles [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	19 years
Intangible assets, Cost	922		929
Intangible assets, Accumulated Amortization	(265)		(259)
Amortizing intangible assets, Net	657		670
Non-compete agreements [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	5 years
Intangible assets, Cost	43		43
Intangible assets, Accumulated Amortization	(40)		(37)
Amortizing intangible assets, Net	3		6
Technology [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	14 years
Intangible assets, Cost	117		118
Intangible assets, Accumulated Amortization	(40)		(38)
Amortizing intangible assets, Net	77		80
Other [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	8 years
Intangible assets, Cost	142		152
Intangible assets, Accumulated Amortization	(83)		(82)
Amortizing intangible assets, Net	59		70
Total Amortizing Intangible Assets [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Weighted Average Amortization Period	17 years
Intangible assets, Cost	1,224		1,242
Intangible assets, Accumulated Amortization	(428)		(416)
Amortizing intangible assets, Net	796		826
Solstas, Summit Health, and Steward [Member]
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]
Goodwill deductible for tax purposes			103
Intangible assets			$ 270