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, 2022	May 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements			0.6	0.5	0.6	0.5
Common stock dividends per share, declared (in dollars per share)	$ 1.73	$ 1.57		$ 1.57	$ 3.30	$ 3.02
Increase in quarterly common stock dividend (percent)	10.00%