HEALTH CARE REFORM (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Supplementary Insurance Information, by Segment [Line Items]
Other current assets	$ 17,402		$ 15,536
Trade accounts payable and accrued expenses	(3,554)		(2,095)
Other long-term assets	1,761		1,583
Other long-term liabilities	(281)		(236)
Risk Adjustment Settlement
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable	131		131
Other current assets	0		0
Trade accounts payable and accrued expenses	(89)		(89)
Net current asset	42		42
Other long-term assets	30		0
Other long-term liabilities	(32)		0
Net long-term (liability) asset	(2)		0
Total net asset	40		42
Reinsurance Recoverables
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable	0		0
Other current assets	535		586
Trade accounts payable and accrued expenses	0		0
Net current asset	535		586
Other long-term assets	47		0
Other long-term liabilities	0		0
Net long-term (liability) asset	47		0
Total net asset	582		586
Risk Corridor Settlement
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable	0		0
Other current assets	93		55
Trade accounts payable and accrued expenses	(2)		(4)
Net current asset	91		51
Other long-term assets	21		0
Other long-term liabilities	(2)		0
Net long-term (liability) asset	19		0
Total net asset	110		51
Health Care Reform
Supplementary Insurance Information, by Segment [Line Items]
Expected payment of annual health insurance industry fee	882
Amortization of deferred charges	220	137
Deferred costs	$ 662