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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Available-for-Sale Securities    
Amortized Cost $ 3,033 $ 0
Gross Unrealized Gains 11  
Gross Unrealized Losses (1)  
Estimated Fair Value 3,044  
U.S. treasury securities    
Available-for-Sale Securities    
Amortized Cost 1,222  
Gross Unrealized Gains 3  
Gross Unrealized Losses 0  
Estimated Fair Value 1,224  
U.S. government agencies securities    
Available-for-Sale Securities    
Amortized Cost 15  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Estimated Fair Value 15  
Corporate debt securities    
Available-for-Sale Securities    
Amortized Cost 1,392  
Gross Unrealized Gains 7  
Gross Unrealized Losses 0  
Estimated Fair Value 1,398  
Residential mortgage and asset-backed securities    
Available-for-Sale Securities    
Amortized Cost 405  
Gross Unrealized Gains 2  
Gross Unrealized Losses 0  
Estimated Fair Value $ 407