Investment Securities - Schedule Of Realized Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 1	$ 1	$ 3	$ 2
Gross realized losses	0	0	(495)	0
Net realized gain (loss) on available-for-sale securities	1	1	(492)	2
Net realized gain on equity securities	28	15	61	53
Net unrealized gain on equity securities	27	58	49	41
Other gain (loss) on investments, net	$ 56	$ 74	$ (382)	$ 96