v3.26.1
INVESTMENT SECURITIES - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Held to Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 52 $ 170
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value 52 170
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 21 118
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value 21 118
U.S. treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 31 52
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value $ 31 $ 52