Income and Dividends per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1			1			1	2
Net income	$ 453	$ 287	$ 417	$ 817	$ 966	$ 1,304	$ 1,157	$ 3,087
Weighted average common shares outstanding (in shares)	603			670			615	701
Effect of dilutive securities (in shares)	1			2			1	2
Weighted average common shares, diluted (in shares)	604			672			616	703
Net income per share:
Basic (in dollars per share)	$ 0.75			$ 1.22			$ 1.88	$ 4.40
Diluted (in dollars per share)	0.75			1.22			1.88	4.39
Dividends per share (in dollars per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.08	$ 0.08	$ 0.07	$ 0.30	$ 0.23