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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, P&C (Details) - Property and Casualty Insurance Products - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Discount Rate [Line Items]      
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts $ 1,334 $ 1,331 $ 1,331
Amount of discount 367 388 388
Carrying value of liability for unpaid losses and loss adjustment expenses 967 943 943
Discount accretion included in losses and loss adjustment expenses $ 36 $ 33 $ 40
Minimum      
Weighted Average Discount Rate [Line Items]      
Discount Rate 0.83% 1.76% 1.77%
Maximum      
Weighted Average Discount Rate [Line Items]      
Discount Rate 14.03% 14.03% 14.15%
Weighted Average Expected Life      
Weighted Average Discount Rate [Line Items]      
Discount Rate 2.68% 2.91% 2.98%