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Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 32,287 |
Less: payments |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 32,297 |
Group Insurance Policies [Member] |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 8,512 | $ 5,772
Reinsurance recoverables | 209 | 208
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 8,303 | 5,564
Provision for unpaid losses and loss adjustment expense |  |
Current incurral year | 3,423 | 1,960
Prior year's discount accretion | 175 | 148
Prior incurral year development | (284) | (162)
Total provision for unpaid losses and loss adjustment expenses | 3,314 | 1,946
Less: payments |  |
Current incurral year | 1,659 | 917
Prior incurral years | 1,741 | 1,118
Total payments | 3,400 | 2,035
Ending liabilities for unpaid losses and loss adjustment expenses, net | 8,259 | 5,475
Reinsurance recoverables | 241 | 208
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,500 | 5,683
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 131 | 74
Aetna Group Insurance [Member] | Group Insurance Policies [Member] |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions | $ 42 | $ 0

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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=99382578&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=99382578&loc=d3e14764-158437 + Details
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- Definition Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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://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=99382578&loc=d3e14764-158437 Reference 3: 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=99382578&loc=d3e14764-158437 + Details
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