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Investments - Available-for-Sale Investments (Details)
$ in Millions
Jun. 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 $ 1,484 $ 1,858
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 33 $ 77
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 890 1,116
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 2,031 $ 1,398
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 162 $ 135
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 1,080 624
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 992 $ 1,124
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 21 $ 45
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 561 683
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,234 $ 887
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 90 $ 76
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 627 371
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 275 $ 395
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 8 $ 20
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 193 220
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 541 $ 319
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 48 $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 256 131
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 144 $ 161
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 2 $ 6
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 88 108
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 164 $ 118
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 15 $ 14
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 86 59
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 55 $ 75
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 29 83
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 82 $ 57
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 8 $ 7
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 103 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 $ 18 $ 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 19 16
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 10 $ 17
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 1 $ 2
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 8 6