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Reserve for Unpaid Losses and Loss Adjustment Expenses Level 4 (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | $ 27,839 |  | $ 27,605 |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 220 | $ 227 |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 23,265 |  | 23,311 |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 2,350 |  |  |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 22,130 | 21,904 | 21,833 | $ 21,825
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 2,809 | 2,746 | 2,776 | 2,882
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 19,321 | 19,158 | 19,057 | 18,943
Reinsurance Recoverables, Including Reinsurance Premium Paid |  | 2,461 |  |
Current Year Claims and Claims Adjustment Expense | 3,563 | 3,447 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 2 | 384 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 3,565 | 3,831 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | 1,009 | 1,066 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | 2,292 | 2,550 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 3,301 | 3,616 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Accident and Health Insurance Product Line [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (20) | (83) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Change in Workers Compensation Discount Including Accretion [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 16 | 14 |  |
Property, Liability and Casualty Insurance Product Line [Member] | General Liability [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 10 | 66 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Package Business [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 52 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Commercial Property [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (6) | (3) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Professional Liability [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | (33) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Surety Product Line [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (10) | (6) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Homeowners [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | (5) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Net Asbestos Reserves [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 197 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Net Environmental Reserves [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 71 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Catastrophes [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (13) | (5) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Uncollectible Reinsurance [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | (30) |  |
Property, Liability and Casualty Insurance Product Line [Member] | Other Reserve Re Estimates [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 5 | 8 |  |
Property, Liability and Casualty Insurance Product Line [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 2 | 384 |  |
Commercial Lines [Member] | Auto Liability [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 20 | 1 |  |
Personal Auto Liability [Member] | Auto Liability [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 140 |  |
Group Insurance Policies [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Claims and Claims Adjustment Expense | 5,709 | 5,822 | 5,772 | 5,889
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 212 | 216 | 208 | 218
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 5,497 | 5,606 | $ 5,564 | $ 5,671
Current Year Claims and Claims Adjustment Expense | 1,319 | 1,287 |  |
Liability for Unpaid Claims and Claims Adjustment Expense Prior Years Interest | 101 | 105 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (112) | (98) |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 1,308 | 1,294 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | 542 | 523 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | 833 | 836 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 1,375 | 1,359 |  |
Group Insurance Policies [Member] | group life term, disability and accident [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 45 | 30 |  |
Group Insurance Policies [Member] | Short-term Disability [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 65 | 65 |  |
Operating Expense [Member] |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | $ 0 | $ 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://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 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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