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Investments - Available-for-Sale Investments (Details)
$ in Millions
Sep. 30, 2023
USD ($)
position
Dec. 31, 2022
USD ($)
position
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 1,363 $ 1,858
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 35 $ 77
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 880 1,116
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 2,470 $ 1,398
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 183 $ 135
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 1,321 624
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 942 $ 1,124
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 23 $ 45
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 549 683
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,559 $ 887
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 98 $ 76
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 785 371
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 272 $ 395
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 10 $ 20
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 219 220
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 567 $ 319
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 57 $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 297 131
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 136 $ 161
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 6
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 96 108
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 206 $ 118
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 16 $ 14
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 100 59
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 75
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 83
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 121 $ 57
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 10 $ 7
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 123 57
U.S. Treasury notes    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value   $ 88
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses   $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position   6
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value   $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses   $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position   0
Other    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 13 $ 15
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 16 16
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 17 $ 17
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 2 $ 2
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 16 6