v3.26.1
Derivatives - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 10,196,000,000   $ 10,196,000,000   $ 6,269,000,000
Derivative, Collateral, Right to Reclaim Cash 23,000,000   23,000,000   27,000,000
Cash collateral held 49,000,000   49,000,000   50,000,000
Securities Received as Collateral 10,000,000   10,000,000   2,000,000
Collateral Securities Repledged, Delivered, or Used 0   0   0
Collateral Pledged          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Cash 9,000,000   9,000,000   7,000,000
Asset Pledged as Collateral [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Securities 15,000,000   15,000,000   22,000,000
Asset Pledged as Collateral [Member] | Over the Counter [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Securities 257,000,000   257,000,000   98,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 0 $ 0 0 $ 0  
AOCI Attributable to Parent [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     2,000,000    
Not Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 3,358,000,000   3,358,000,000   1,906,000,000
Interest rate swaps | Not Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 333,000,000   333,000,000   $ 333,000,000
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Junior Subordinated Debentures $ 500,000,000   $ 500,000,000