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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-21 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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