Common Equity - Common Stock Dividends (Details) - $ / shares	3 Months Ended					12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dividends Paid and Payable
Dividends per share (in dollars per share)		$ 0.6775	$ 0.6775	$ 0.6775	$ 0.6775		$ 2.71	$ 2.53	$ 2.36
Subsequent event
Dividends Paid and Payable
Dividends per share (in dollars per share)	$ 0.7275
Annualized dividend (in dollars per share)						$ 2.91
Subsequent event | Minimum
Dividends Paid and Payable
Target dividend payout ratio (as a percent)						65.00%
Subsequent event | Maximum
Dividends Paid and Payable
Target dividend payout ratio (as a percent)						70.00%