Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 23	$ 102	$ 173
Gross realized losses	0	0	2
Net realized gain on available-for-sale securities	23	102	171
Net realized gain on equity securities	72	190	107
Net unrealized (loss) gain on equity securities	(215)	(7)	29
Other (loss) gain on investments, net	$ (120)	$ 285	$ 307