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Investments - Available-for-Sale (Details)
$ in Millions
Dec. 31, 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 $ 386 $ 1,858
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 3 $ 77
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 258 1,116
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 2,431 $ 1,398
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 126 $ 135
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 1,261 624
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 263 $ 1,124
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 1 $ 45
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 160 683
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 1,553 $ 887
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 64 $ 76
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 754 371
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 123 $ 395
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 2 $ 20
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 98 220
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 549 $ 319
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 42 $ 36
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 283 131
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 0 $ 161
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 0 $ 6
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 0 108
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 195 $ 118
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 12 $ 14
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 91 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 $ 117 $ 57
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 6 $ 7
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 116 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 $ 0 $ 15
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 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 17 6