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BENEFITS PAYABLE - Activity in Benefits Payable (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | $ 4,563 | $ 4,976
Less: Premium deficiency reserve | 0 | (176)
Less: Reinsurance recoverables | (76) | (85)
Balance | 4,487 | 4,715
Incurred related to: |  |
Current year | 22,576 | 23,211
Prior years | (345) | (435)
Total incurred | 22,231 | 22,776
Paid related to: |  |
Current year | (18,332) | (18,720)
Prior years | (3,626) | (3,925)
Total paid | (21,958) | (22,645)
Premium deficiency reserve | 0 | (337)
Reinsurance recoverable | (78) | (75)
Ending balance | 4,838 | 5,258
Retail |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 3,507 | 3,600
Less: Reinsurance recoverables | (76) | (85)
Balance | 3,431 | 3,515
Incurred related to: |  |
Current year | 20,010 | 19,259
Prior years | (287) | (299)
Total incurred | 19,723 | 18,960
Paid related to: |  |
Current year | (16,385) | (15,766)
Prior years | (2,707) | (2,946)
Total paid | (19,092) | (18,712)
Reinsurance recoverable | (78) | (75)
Ending balance | 4,140 | 3,838
Total IBNR | 2,700 |
Group and Specialty |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 578 | 616
Incurred related to: |  |
Current year | 2,629 | 2,556
Prior years | (31) | (38)
Total incurred | 2,598 | 2,518
Paid related to: |  |
Current year | (2,117) | (2,000)
Prior years | (518) | (543)
Total paid | (2,635) | (2,543)
Ending balance | 541 | 591
Total IBNR | 477 |
Individual Commercial |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 454 | 740
Less: Premium deficiency reserve | 0 | (176)
Balance | 454 | 564
Incurred related to: |  |
Current year | 304 | 1,816
Prior years | (26) | (97)
Total incurred | 278 | 1,719
Paid related to: |  |
Current year | (223) | (1,396)
Prior years | (378) | (417)
Total paid | (601) | (1,813)
Premium deficiency reserve | 0 | (337)
Ending balance | 131 | $ 807
Total IBNR | $ 119 |

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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