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Derivatives - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 10,437,000,000		$ 10,437,000,000		$ 6,269,000,000
Derivative, Collateral, Right to Reclaim Cash	18,000,000		18,000,000		27,000,000
Cash collateral held	39,000,000		39,000,000		50,000,000
Securities Received as Collateral	6,000,000		6,000,000		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	13,000,000		13,000,000		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	247,000,000		247,000,000		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			30,000,000
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	3,657,000,000		3,657,000,000		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