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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 23, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | $ 33,029,000,000 |  |  |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | (16,000,000) | $ 0 | $ 0 |
Payments |  |  |  |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | 36,517,000,000 | 33,029,000,000 |  |
Property and Casualty Insurance Products |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning liabilities for unpaid losses and loss adjustment expenses, gross | 24,584,000,000 | 23,775,000,000 | 22,545,000,000 |
Reinsurance and other recoverables | 4,232,000,000 | 3,957,000,000 | 3,488,000,000 |
Beginning liabilities for unpaid losses and loss adjustment expenses, net | 20,352,000,000 | 19,818,000,000 | 19,057,000,000 |
Provision for unpaid losses and loss adjustment expenses |  |  |  |
Total provision for unpaid losses and loss adjustment expenses | 7,398,000,000 | 6,940,000,000 | 7,340,000,000 |
Payments |  |  |  |
Current accident year | (2,374,000,000) | (2,452,000,000) | (2,751,000,000) |
Prior accident years | (4,374,000,000) | (3,954,000,000) | (3,828,000,000) |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | (1,000,000) | 0 | 0 |
Ending liabilities for unpaid losses and loss adjustment expenses, net | 22,986,000,000 | 20,352,000,000 | 19,818,000,000 |
Reinsurance and other recoverables | 5,275,000,000 | 4,232,000,000 | 3,957,000,000 |
Ending liabilities for unpaid losses and loss adjustment expenses, gross | $ 28,261,000,000 | 24,584,000,000 | 23,775,000,000 |
Property and Casualty Insurance Products | The Navigators Group, Inc. [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reserves net Reinsurance and Other Recoverables |  | $ 0 | $ 0 | $ 2,001,000,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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