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Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses Level 4 P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Less payment |  |  |  |  |  |  |  |  |  |  |
Reinsurance Recoverables |  |  |  |  | $ 23,189 |  | $ 22,920 |  |  |  |
Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current accident year benefit from discounting property and casualty reserves |  | $ 35 | $ 34 | $ 46 |  |  |  |  |  |  |
Accretion of discounts for prior accident years |  | 38 | 31 | 31 |  |  |  |  |  |  |
Group Insurance Policies [Member] |  |  |  |  |  |  |  |  |  |  |
Reserve Development |  |  |  |  |  |  |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  | 6,084 | 6,308 | 6,547 |  |  |  |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments |  |  |  |  | 285 |  | 271 |  | $ 267 |  | $ 252
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  | 5,680 | 5,813 | 6,041 | 5,680 |  | 5,813 |  | 6,041 |  | 6,295
Add provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |  |  |  |
Current Year Claims and Claims Adjustment Expense |  | 2,371 | 2,370 | 2,534 |  |  |  |  |  |  |
Prior years |  | (64) | 11 | 17 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  | 2,435 | 2,359 | 2,517 |  |  |  |  |  |  |
Less payment |  |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year |  | 1,214 | 1,161 | 1,207 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years |  | 1,354 | 1,426 | 1,564 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid |  | 2,568 | 2,587 | 2,771 |  |  |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net |  | 5,680 | 5,813 | 6,041 |  |  |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | 5,965 | 6,084 | 6,308 |  |  |  |  |  |  |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Reserve Development |  |  |  |  |  |  |  |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross |  | 21,806 | 21,704 | 21,716 |  |  |  |  |  |  |
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments |  |  |  |  | 2,882 | [1] | 3,041 | [1] | 3,028 | [1] | 3,027
Beginning liabilities for unpaid losses and loss adjustment expenses, net |  | 18,943 | 18,765 | 18,676 | 18,943 |  | 18,765 |  | 18,676 |  | $ 18,689
Add provision for unpaid losses and loss adjustment expenses |  |  |  |  |  |  |  |  |  |  |
Current Year Claims and Claims Adjustment Expense |  | 6,647 | 6,572 | 6,621 |  |  |  |  |  |  |
Prior years |  | (250) | (228) | (192) |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  | 6,897 | 6,800 | 6,813 |  |  |  |  |  |  |
Less payment |  |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year |  | 2,653 | 2,639 | 2,552 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years |  | 4,066 | 4,072 | 4,274 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid |  | 6,719 | 6,711 | 6,826 |  |  |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, net |  | 18,943 | 18,765 | 18,676 |  |  |  |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross |  | $ 21,825 | $ 21,806 | $ 21,704 |  |  |  |  |  |  |
Reinsurance Recoverables |  |  |  |  | 2,515 |  | 2,730 |  | 2,735 |  |
Property, Liability and Casualty Insurance Product Line [Member] |  |  |  |  |  |  |  |  |  |  |
Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Supplemental Information for Property, Casualty Insurance Underwriters, Discount Deducted from Reserves | [2] |  |  |  | $ 523 |  | $ 556 |  | $ 553 |  |
[1] | Includes reinsurance recoverables of $2,515, $2,730 and $2,735 as of December 31, 2015, 2014 and 2013, respectively.
[2] | Reserves for permanently disabled claimants have been discounted using the weighted average interest rates of 3.24%, 3.50%, and 3.50% for the years ended December 31, 2015, 2014, and 2013, respectively.

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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),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&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 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b + Details
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