Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 1,939	$ (2,675)
Number of common shares:
Weighted average outstanding (in shares)	1,100,278,261	1,114,610,964
Weighted average and potential dilutive outstanding (in shares)	1,102,396,636	1,114,610,964
Earnings (loss) per common share
Basic (in dollars per share)	$ 1.76	$ (2.40)
Diluted (in dollars per share)	$ 1.76	$ (2.40)
Stock options
Number of common shares:
Issued upon assumed exercise of outstanding stock options (in shares)	0	0
Restricted Common Stock
Number of common shares:
Effect of issuance of non-vested restricted common stock and units (in shares)	790,131	0
Restricted units
Number of common shares:
Effect of issuance of non-vested restricted common stock and units (in shares)	1,328,244	0
Performance units
Number of common shares:
Effect of issuance of non-vested performance units (in shares)	0	0