GUARANTEES AND CONTINGENCIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Loss Contingencies [Line Items]
Sacred Heart Complaint Settlement	$ 46	$ 46
New TRICARE South Region Contract
Loss Contingencies [Line Items]
Contract term, years		5
Puerto Rico Health Insurance Administration Contracts East Southeast And Southwest Regions
Loss Contingencies [Line Items]
Contract term, years		3
Medicare
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		71.00%
Military Services
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		5.00%
Medicaid
Loss Contingencies [Line Items]
Percentage of premiums and services revenue		2.00%