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Schedule VI Supplementary Information Concerning Property and Casualty Insurance Operations (Details) - Property and Casualty Insurance Products - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items] |  |  |
Discount Deducted From Liabilities | $ 367 | $ 388 | $ 388
Losses and Loss Adjustment Expenses Incurred Related to: Current Year | 7,794 | 7,463 | 7,107
Losses and Loss Adjustment Expenses Incurred Related to: Prior Year | (136) | (65) | (167)
Paid Losses and Loss Adjustment Expenses | $ 6,404 | $ 6,748 | $ 6,406

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