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Capital 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, 2021
Banking Regulation, Total Capital [Abstract]
Quarterly cash dividends paid (in dollars per share)	$ 0.20	$ 0.19	$ 0.18	$ 0.17	$ 0.16	$ 0.70
Quarterly cash dividends declared (in dollars per share)	$ 0.20	$ 0.19	$ 0.18	$ 0.17	$ 0.16	$ 0.70

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
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Aggregate dividends declared during the period for each share of common stock outstanding.

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-Name Accounting Standards Codification
-Topic 505
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