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Reserve for Unpaid Losses and Loss Adjustment Expenses Level 4 (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  | $ 27,605 |  |  |
Reinsurance recoverables |  | 328 | $ 260 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | 28,232 |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 23,323 |  | $ 23,311 |
Workers’ compensation |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | (29) | (87) |  |
Change in Workers Compensation Discount Including Accretion [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 21 | 21 |  |
General Liability [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 10 | 67 |  |
Package business |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | (22) | 50 |  |
Professional liability |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | (35) |  |
Bond |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 10 | (6) |  |
Homeowners |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | (4) |  |
Net Asbestos Reserves [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | 197 |  |
Net Environmental Reserves [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | 71 |  |
Catastrophes [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | (12) | (7) |  |
Uncollectible Reinsurance [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | (30) |  |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  | 21,833 | 21,825 |  |
Reinsurance recoverables |  | 2,776 | 2,882 |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  | 19,732 | 18,921 | 19,057 | $ 18,943
Current incurral year |  | 5,587 | 5,215 |  |
Prior incurral year development [2] |  | 1 | 409 |  |
Current incurral year |  | 5,588 | 5,624 |  |
Current incurral year |  | 1,770 | 1,901 |  |
Prior incurral years |  | 3,143 | 3,380 |  |
Total payments |  | 4,913 | 5,281 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net |  | 19,732 | 18,921 | 19,057 | 18,943
Reinsurance recoverables |  | 2,817 | 2,694 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | 22,549 | 21,615 |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 2,355 | 2,313 |  |
Other Reserve Re Estimates [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 8 | 11 |  |
Commercial Lines [Member] | Commercial Property [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | (5) | 2 |  |
Commercial Lines [Member] | Auto Liability [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 20 | 19 |  |
Personal Auto Liability [Member] | Auto Liability [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 0 | 140 |  |
Group Benefits |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  | 5,772 | 5,889 |  |
Reinsurance recoverables |  | 208 | 218 |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  | 5,475 | 5,572 | 5,564 | 5,671
Current incurral year |  | 1,960 | 1,930 |  |
Prior year's discount accretion |  | 148 | 155 |  |
Prior incurral year development [2] |  | (162) | (126) |  |
Current incurral year |  | 1,946 | 1,959 |  |
Current incurral year |  | 917 | 932 |  |
Prior incurral years |  | 1,118 | 1,126 |  |
Total payments |  | 2,035 | 2,058 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net |  | 5,475 | 5,572 | $ 5,564 | $ 5,671
Reinsurance recoverables |  | 208 | 211 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | 5,683 | 5,783 |  |
Group Benefits | Short-term Disability [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 105 | 85 |  |
Group Benefits | group life term, disability and accident [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior incurral year development [2] |  | 55 | 30 |  |
Operating Expense [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Current incurral year |  | 0 | 0 |  |
Maxum [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions | $ 122 |  |  |  |
P&C Runoff Subsidiaries [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  | 0 | 487 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net |  | $ 0 | $ 487 |  |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 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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