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Derivatives - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount $ 7,416   $ 7,416   $ 7,081
Derivative, Collateral, Right to Reclaim Cash 27   27   31
Cash collateral held 40   40   78
Securities Received as Collateral 0   0   0
Collateral Pledged          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Cash 12   12   10
Asset Pledged as Collateral [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Securities 23   23   1
Asset Pledged as Collateral [Member] | Over the Counter [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Collateral, Right to Reclaim Securities 104   104   103
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     21    
Not Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 2,851   2,851   2,210
Interest rate swaps | Not Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, Notional Amount 333   333   $ 344
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   $ 500