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Investments - Available-for-Sale Investments (Details)
$ in Millions
Sep. 30, 2024
USD ($)
position
Dec. 31, 2023
USD ($)
position
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 386
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 3
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 258
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,776 $ 2,431
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 66 $ 126
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 952 1,261
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 263
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 160
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,057 $ 1,553
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 26 $ 64
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 506 754
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 123
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 2
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 98
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 444 $ 549
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 29 $ 42
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 256 283
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 157 $ 195
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 6 $ 12
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 77 91
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 102 $ 117
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 4 $ 6
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 97 116
Other    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 0
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 0
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 16 $ 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 16 17