v3.26.1
INVESTMENTS - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale    
Amortized Cost $ 1,000 $ 3,033
Gross Unrealized Gains 1 11
Gross Unrealized Losses (4) (1)
Estimated Fair Value 997 3,044
U.S. treasury securities    
Debt Securities, Available-for-Sale    
Amortized Cost 300 1,222
Gross Unrealized Gains 0 3
Gross Unrealized Losses (1) 0
Estimated Fair Value 298 1,224
U.S. government agencies securities    
Debt Securities, Available-for-Sale    
Amortized Cost 0 15
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 0 15
Corporate debt securities    
Debt Securities, Available-for-Sale    
Amortized Cost 557 1,392
Gross Unrealized Gains 0 7
Gross Unrealized Losses (2) 0
Estimated Fair Value 555 1,398
Residential mortgage and asset-backed securities    
Debt Securities, Available-for-Sale    
Amortized Cost 144 405
Gross Unrealized Gains 0 2
Gross Unrealized Losses 0 0
Estimated Fair Value $ 144 $ 407