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Reserve for Unpaid Losses and Loss Adjustment Expenses - Reserve for Unpaid Losses and Loss Adjustments (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
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 | 32,080 |  |  |
Accident and Health Insurance Product Line [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (73) | $ (20) |  |
Change in Workers Compensation Discount Including Accretion [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 20 | 16 |  |
General Liability [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 28 | 10 |  |
Package business |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (7) | 0 |  |
Professional liability |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 8 | 0 |  |
Bond |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 0 | (10) |  |
Net Asbestos Reserves [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 0 | 0 |  |
Net Environmental Reserves [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 0 | 0 |  |
Catastrophes [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (34) | (13) |  |
Uncollectible Reinsurance [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 11 | 0 |  |
Other Insurance Product Line [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 3 | 5 |  |
Scenario, Adjustment [Member] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Reinsurance recoverables | 90 |  |  |
Less: payments |  |  |  |
Reinsurance recoverables | 90 |  |  |
Scenario, Adjustment [Member] | Catastrophes [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 123 |  |  |
Scenario, Forecast [Member] | Catastrophes [Member] |  |  |  |
Less: payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 850 |  |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Property Insurance Product Line [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (12) | (6) |  |
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (10) | 20 |  |
Property and Casualty, Personal Insurance Product Line [Member] | Property Insurance Product Line [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | (13) | 0 |  |
Property and Casualty, Personal Insurance Product Line [Member] | Automobile |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 0 | 0 |  |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 23,775 | 22,545 |  |
Reinsurance recoverables | 3,772 | 3,508 | $ 3,957 | $ 3,488
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 19,818 | 19,057 |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Current incurral year | 3,362 | 3,563 |  |
Prior incurral year development [1] | (79) | 2 |  |
Total provision for unpaid losses and loss adjustment expenses [2] | 3,283 | 3,565 |  |
Less: payments |  |  |  |
Current accident year | 934 | 1,009 |  |
Prior accident years | 2,308 | 2,292 |  |
Total payments | 3,242 | 3,301 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 19,859 | 19,321 |  |
Reinsurance recoverables | 3,772 | 3,508 | 3,957 | 3,488
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 23,631 | 22,829 |  |
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 | 235 | 212 | 209 | 208
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 8,303 | 5,564 |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Current incurral year | 2,317 | 1,319 |  |
Prior year's discount accretion | 120 | 101 |  |
Prior incurral year development [1] | (217) | (112) |  |
Total provision for unpaid losses and loss adjustment expenses [2] | 2,220 | 1,308 |  |
Less: payments |  |  |  |
Current accident year | 974 | 542 |  |
Prior accident years | 1,335 | 833 |  |
Total payments | 2,309 | 1,375 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 8,214 | 5,497 |  |
Reinsurance recoverables | 235 | 212 | $ 209 | $ 208
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,449 | 5,709 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 85 | 48 |  |
Group Insurance Policies [Member] | Long-term Disability [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | 0 | 65 |  |
Group Insurance Policies [Member] | group life term, disability and accident [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior incurral year development [1] | $ 65 | $ 45 |  |

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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 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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