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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 279 $ 278
Gross Unrealized Gain 0 0
Gross Unrealized Loss (3) (6)
Fair Value 276 272
Government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 93 91
Gross Unrealized Gain 0 0
Gross Unrealized Loss (1) (2)
Fair Value 92 89
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 186 187
Gross Unrealized Gain 0 0
Gross Unrealized Loss (2) (4)
Fair Value $ 184 $ 183