Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gains	$ 2	$ 44	$ 23	$ 82
Net realized gain on available-for-sale securities	2	44	23	82
Net realized gain on equity securities	5	45	67	159
Net unrealized loss on equity securities	(61)	(65)	(263)	(29)
Other (loss) gain on investments, net	$ (54)	$ 24	$ (173)	$ 212