Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders Equity [Line Items]
Dividends amount	$ 830	$ 667	$ 229	$ 203	$ 1,497	$ 432
Dividends rate per share	$ 1.27	$ 1.00	$ 0.34	$ 0.30
Fixed Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 105	$ 109	$ 75	$ 76	214	151
Dividends rate per share		$ 0.16
Variable Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 725	$ 558	$ 154	$ 127	$ 1,283	$ 281