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Investments - Available-for-Sale Investments (Details)
$ in Millions
Sep. 30, 2022
USD ($)
security
position
Dec. 31, 2021
USD ($)
position
security
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 2,815 $ 1,706
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 163 $ 18
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 1,457 677
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 708 $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 80 $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions 305 0
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 1,764 $ 1,063
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 103 $ 12
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 909 395
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 433 $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 45 $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 167 0
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 555 $ 408
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 36 $ 4
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | position 282 146
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 188 $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 25 $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | position 75 0
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 242 $ 166
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 13 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security 128 75
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 56 $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 6 $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | security 28 0
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 106 $ 69
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 7 $ 1
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security 110 61
In a Continuous Loss Position for 12 Months or More, Estimated Fair Value $ 31 $ 0
In a Continuous Loss Position for 12 Months or More, Gross Unrealized Losses $ 4 $ 0
In a Continuous Loss Position for 12 Months or More, Total Number of Positions | security 35 0
U.S. Treasury notes    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 116  
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 | security 8  
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 | security 0  
Other    
Debt Securities, Available-for-sale [Line Items]    
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value $ 32  
In a Continuous Loss Position for Less than 12 Months, Gross Unrealized Losses $ 3  
In a Continuous Loss Position for Less than 12 Months, Total Number of Positions | security 20  
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 | security 0