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Reserve for Unpaid Losses and Loss Adjustment Expenses - Discounted Reserves, P&C (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted Average Discount Rate [Line Items]      
Current accident year benefit from discounting property and casualty reserves $ 15 $ 27 $ 35
Property and Casualty Insurance Products      
Weighted Average Discount Rate [Line Items]      
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts 1,387 1,504 1,607
Less: amount of discount 410 483 523
Carrying value of liability for unpaid losses and loss adjustment expenses 977 1,021 1,084
Discount accretion included in losses and loss adjustment expenses $ 30 $ 29 $ 38
Weighted average discount rate 3.06% 3.11% 3.24%
Minimum | Property and Casualty Insurance Products      
Weighted Average Discount Rate [Line Items]      
Range of discount rates 1.77% 1.77% 1.77%
Maximum | Property and Casualty Insurance Products      
Weighted Average Discount Rate [Line Items]      
Range of discount rates 14.15% 14.15% 14.15%