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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 188 $ 2 $ 464 $ 270
Other comprehensive income        
Unrealized gain on available-for-sale debt securities 3 8 6 4
Tax expense 0 (2) (1) (1)
Unrealized gain on available-for-sale debt securities, net of tax 3 6 5 3
Unrealized gain on cash flow hedges 0 0 1 0
Tax expense 0 0 0 0
Unrealized gain on cash flow hedges, net of tax 0 0 1 0
Other comprehensive income, net of tax 3 6 6 3
Total comprehensive income, net of tax $ 191 $ 8 $ 470 $ 273