Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) Earnings Per Share and Dividends (Details 1) - $ / shares shares in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2023	May 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements			0.5	0.6	0.6	0.6
Common stock dividends per share, declared (in dollars per share)		$ 1.73	$ 1.87	$ 1.73	$ 3.60	$ 3.30
Increase in quarterly common stock dividend (percent)	8.00%