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Preferred stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Class of Stock [Line Items]
Preferred stock, shares authorized (shares)	100,000,000		100,000,000	100,000,000
Preferred stock, par value (usd per share)	$ 0.01		$ 0.01	$ 0.01
Preferred stock, percentage ownership by subsidiary	1		1
Series J Preferred Stock
Class of Stock [Line Items]
Depository share, shares issued (in shares)		500,000
Depositary shares per share	1.00%		1.00%
Redemption period following a regulatory capital treatment event			90 days
Liquidation preference per share (usd per share)	$ 100,000		$ 100,000
Series K Preferred Stock
Class of Stock [Line Items]
Depository share, shares issued (in shares)		20,000,000
Depositary shares per share	0.03%		0.03%
Redemption period following a regulatory capital treatment event			90 days
Liquidation preference per share (usd per share)	$ 100,000		$ 100,000
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, redemption amount	$ 10		$ 10
Depositary shares per share	1.00%		1.00%
Liquidation preference per share (usd per share)	$ 100,000		$ 100,000
Series L Preferred Stock
Class of Stock [Line Items]
Depository share, shares issued (in shares)	500,000
Depositary shares per share	1.00%		1.00%
Redemption period following a regulatory capital treatment event			90 days
Liquidation preference per share (usd per share)	$ 100,000		$ 100,000

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