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Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses) (Details) (USD $) In Millions | 6 Months Ended |  |
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Jun. 30, 2011 Insurance Loss Recoverable and Changes in Recoveries on Unpaid Losses [Member] | Jun. 30, 2011 Insurance Loss Recoverable and Changes in Recoveries on Unpaid Losses [Member] Insurance Loss Recoverable [Member] | Jun. 30, 2011 Insurance Loss Recoverable and Changes in Recoveries on Unpaid Losses [Member] Unpaid Losses [Member] | Jun. 30, 2011 Non Variable Interest Entities [Member] | Dec. 31, 2010 Non Variable Interest Entities [Member]
Gross Reserve as of beginning balance, Insurance Loss Recoverable |  | $ 2,531 |  | $ 2,658 | $ 2,531
Gross Reserve as of beginning balance, Recoveries on Unpaid Losses |  |  | 896 |  |
Gross Reserve as of beginning balance, Total | 3,427 |  |  |  |
Collections for Cases with Recoveries | (3) | (3) |  |  |
Accretion of Recoveries | 44 | 34 | 10 |  |
Changes in Discount Rates | 22 | 20 | 2 |  |
Changes in Timing of Collections |  |  |  |  |
Changes in Amount of Collections | (116) | (116) |  |  |
Changes in Assumptions | (22) | 190 | (212) |  |
Changes in LAE Recoveries | 7 | 2 | 5 |  |
Gross Reserve as of ending balance, Insurance Loss Recoverable |  | 2,658 |  | 2,658 | 2,531
Gross Reserve as of ending balance, Recoveries on Unpaid Losses |  |  | 701 |  |
Gross Reserve as of ending balance, Total | $ 3,359 |  |  |  |

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- Definition Carrying amount as of the balance sheet date of paid insurance policy claims and LAE expense expected to be recovered. + Details
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- Definition The collections in the period which reduce the recorded receivable pertaining to a loss contingency accrual. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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