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Reserve for Unpaid Losses and Loss Adjustment Expenses - Group Benefits Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 33,029 |  |
Payments |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 36,517 | $ 33,029 |
Group Benefits |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 8,445 | 8,512 | $ 5,772
Reinsurance and other recoverables | 239 | 209 | 208
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 8,206 | 8,303 | 5,564
Provision for unpaid losses and loss adjustment expenses |  |  |
Current accident year | 4,385 | 4,470 | 2,868
Prior year's discount accretion | 219 | 227 | 202
Prior accident year development [1] | (410) | (324) | (185)
Total provision for unpaid losses and loss adjustment expenses | 4,194 | 4,373 | 2,885
Payments |  |  |
Current incurral year | (2,277) | (2,377) | (1,528)
Prior incurral years | (2,114) | (2,135) | (1,451)
Total payments | (4,391) | (4,512) | (2,979)
Ending liabilities for unpaid losses and loss adjustment expenses, net | 8,009 | 8,206 | 8,303
Reinsurance and other recoverables | 247 | 239 | 209
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,256 | 8,445 | 8,512
Group Benefits | Aetna Group Insurance [Member] |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Add: Aetna U.S. group life and disability business acquisitions | 0 | 42 | 2,833
Other Operating Income (Expense) [Member] | Group Benefits |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |
Total provision for unpaid losses and loss adjustment expenses | $ 178 | $ 194 | $ 111

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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