Share-Based Compensation Plans - Restricted share unit activity (Details) - Restricted share units - $ / shares shares in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Non-vested share awards (in shares)
Non-vested at beginning of period (in shares)	3,075	3,309	3,309
Granted (in shares)	1,019	861
Vested (in shares)	(950)	(1,094)
Forfeited (in shares)	(117)	(116)
Non-vested at end of period (in shares)	3,027	2,960	3,075
Weighted Average Fair value
Non-vested at beginning of period (in dollars per share)	$ 203	$ 163	$ 163
Granted (in dollars per share)	278	238
Vested (in dollars per share)	178	151
Forfeited (in dollars per share)	214	171
Non-vested at end of period (in dollars per share)	$ 235	$ 189	$ 203