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Reserve for Unpaid Losses and Loss Adjustment Expenses P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 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 | 32,213 |  |  |
Workers’ compensation |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (25) | $ (20) |  |
Change in Workers Compensation Discount Including Accretion [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 10 | 8 |  |
Liability |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 8 | 10 |  |
Package business |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 8 | 0 |  |
Commercial Property [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (13) | 1 |  |
Professional liability |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 2 | 0 |  |
Bond |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 0 | (10) |  |
Commercial Auto Liability [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (5) | 20 |  |
Personal Auto Liability [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 0 | 0 |  |
Homeowners |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (12) | 0 |  |
Net Asbestos Reserves [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 0 | 0 |  |
Net Environmental Reserves [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 0 | 0 |  |
Catastrophes [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (3) | (3) |  |
Uncollectible Reinsurance [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | 0 | 0 |  |
Other Reserve Re Estimates [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | (2) | 6 |  |
Property and Casualty Insurance Products |  |  |  |
Product Information [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 1,608 | 1,774 |  |
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 | 3,957 | 3,488 |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 19,777 | 19,179 | $ 19,818 | $ 19,057
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Current accident year | 1,640 | 1,762 |  |
Prior accident year development | (32) | 12 |  |
Less: payments |  |  |  |
Current accident year | 327 | 352 |  |
Prior accident years | 1,322 | 1,300 |  |
Total payments | 1,649 | 1,652 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 19,777 | 19,179 | 19,818 | 19,057
Reinsurance recoverables | 3,938 | 3,478 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 23,715 | 22,657 |  |
Group Insurance Policies [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 41 | 24 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 1,120 | 661 |  |
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 | 8,265 | 5,528 | 8,303 | 5,564
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Current accident year | 1,185 | 678 |  |
Liability for Unpaid Claims and Claims Adjustment Expense Prior Years Interest | 62 | 52 |  |
Prior accident year development | (127) | (69) |  |
Less: payments |  |  |  |
Current accident year | 318 | 178 |  |
Prior accident years | 840 | 519 |  |
Total payments | 1,158 | 697 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 8,265 | 5,528 | $ 8,303 | $ 5,564
Reinsurance recoverables | 233 | 208 |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 8,498 | 5,736 |  |
Group Insurance Policies [Member] | Long-term Disability [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development |  | 35 |  |
Group Insurance Policies [Member] | group life term, disability and accident [Member] |  |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Prior accident year development | $ 40 | $ 35 |  |

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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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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + 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 (cc) -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 (a) -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 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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