v3.26.1
Preferred stock - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2026
Jun. 30, 2026
Dec. 31, 2025
Class of Stock [Line Items]      
Preferred stock, shares authorized (shares)   100,000,000 100,000,000
Preferred stock, par value (usd per share)   $ 0.01 $ 0.01
Preferred stock, percentage ownership by subsidiary   1  
Series H Preferred Stock      
Class of Stock [Line Items]      
Depositary shares per share   1.00%  
Preferred Stock, Redemption Amount   $ 6  
Liquidation preference per share (usd per share)   $ 100,000  
Series M Preferred Stock      
Class of Stock [Line Items]      
Depository share, shares issued (in shares) 500,000    
Depositary shares per share   1.00%  
Redemption period following a regulatory capital treatment event   90 days  
Liquidation preference per share (usd per share)   $ 100,000  
Series K Preferred Stock      
Class of Stock [Line Items]      
Depositary shares per share   0.03%  
Liquidation preference per share (usd per share)   $ 100,000  
Series A Preferred Stock      
Class of Stock [Line Items]      
Depositary shares per share   1.00%  
Liquidation preference per share (usd per share)   $ 100,000