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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 283 $ 278
Gross Unrealized Gain 0 0
Gross Unrealized Loss (4) (6)
Fair Value 279 272
Government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 100 91
Gross Unrealized Gain 0 0
Gross Unrealized Loss (1) (2)
Fair Value 99 89
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 183 187
Gross Unrealized Gain 0 0
Gross Unrealized Loss (3) (4)
Fair Value $ 180 $ 183