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Derivative and Hedging Activities - Company's Carrying Amounts on our Hedged Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loans and leases	$ 819	$ 1,061	$ 2,519	$ 3,421
U. S. treasury obligations
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Items	1,015		1,015		$ 0
Cumulative Amount of Fair Value Hedging Adjustments	15		15		0
GSE CMOs
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Items	2,026		2,026		0
Cumulative Amount of Fair Value Hedging Adjustments	7		7		0
GSE debentures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Items	1,287		1,287		0
Cumulative Amount of Fair Value Hedging Adjustments	11		11		0
Debt securities available-for-sale
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Items	4,328		4,328		0
Cumulative Amount of Fair Value Hedging Adjustments	33		33		0
Loans and leases held-for-investment
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Items	3,389		3,389		5,861
Cumulative Amount of Fair Value Hedging Adjustments	(6)		(6)		$ (18)
Loans and leases	$ 0	$ 0	$ 10	$ 24

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Amount of asset hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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