Stockholders' Equity (Summary Of Dividends Paid On Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stockholders Equity [Line Items]
Dividends amount	$ 667	$ 203
Dividends rate per share	$ 1.00	$ 0.30
Fixed Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 109	$ 76
Dividends rate per share	$ 0.16
Variable Dividend [Member]
Stockholders Equity [Line Items]
Dividends amount	$ 558	$ 127