Earnings per Share (Summary Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ 15,978	$ 2,553	$ (11,182)
Net income attributable to noncontrolling interest	1,534	1,263	(151)
Net income allocated to participating securities	8	2	1
Income (loss) from continuing operations available to common stockholders	14,436	1,288	(11,032)
Income from discontinued operations, net of tax	72	8,448	1,205
Income (loss) available to common stockholders	$ 14,508	$ 9,736	$ (9,827)
Weighted average common shares outstanding:
Basic (in shares)	512	634	649
Effect of dilutive securities (in shares)	4	4	0
Diluted (in shares)	516	638	649
Basic:
Continuing operations	$ 28.17	$ 2.03	$ (16.99)
Discontinued operations	0.14	13.31	1.86
Net income (loss) per share	28.31	15.34	(15.13)
Diluted:
Continuing operations	27.98	2.02	(16.99)
Discontinued operations	0.14	13.22	1.86
Net income (loss) per share	$ 28.12	$ 15.24	$ (15.13)