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SEGMENT INFORMATION - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
Segment
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Jun. 30, 2011
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Jun. 30, 2012
Segment
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Jun. 30, 2011
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| Segment Reporting Disclosure [Line Items] | ||||
| Number of reportable segments | 3 | 3 | ||
| Member co-share amounts and government subsidies | $ 1,200,000,000 | $ 1,000,000,000 | $ 2,400,000,000 | $ 2,000,000,000 |
| Depreciation And Amortization Classified As Benefit Expense | 9,000,000 | 7,000,000 | 17,000,000 | 17,000,000 |
| Litigation settlement associated with Military services business | 46,000,000 | 46,000,000 | ||
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Retail
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| Segment Reporting Disclosure [Line Items] | ||||
| Prior Period Medical Claims Reserve Development | 24,000,000 | 32,000,000 | 57,000,000 | 72,000,000 |
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Employer Group
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| Segment Reporting Disclosure [Line Items] | ||||
| Prior Period Medical Claims Reserve Development | 12,000,000 | (8,000,000) | (18,000,000) | 33,000,000 |
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Other Businesses
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| Segment Reporting Disclosure [Line Items] | ||||
| Prior Period Medical Claims Reserve Development | $ 4,000,000 | $ 9,000,000 | $ 9,000,000 | $ 12,000,000 |