Income (loss) and Dividends per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	2	6
Net income	$ 1,304	$ 97
Weighted average common shares outstanding (in shares)	730	789
Effect of dilutive securities (in shares)	2	0
Weighted average common shares, diluted (in shares)	732	789
Net income (loss) per share:
Basic (in dollars per share)	$ 1.79	$ 0.12
Diluted (in dollars per share)	1.78	0.12
Dividends per share (in dollars per share)	$ 0.07	$ 0.03