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Derivatives and Hedging Activities (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivatives, Fair Value [Line Items] |  |  |
Margin on interest rate swap not netted | $ 368 | $ 175 |
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Outstanding balance | Outstanding balance |
Carrying values of hedged liabilities | $ 18,900 | $ 11,700 |
Cumulative amount of fair value hedging adjustments | 27 | 53 |
Increase (decrease) in interest expense on long term debt and other | 254 | 189 | $ (57)
Not Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount of derivatives | 28,800 | 25,300 |
Other Expense |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) in changes in fair value of derivatives not designated as hedges | 102 | 82 | 8
Credit Valuation Adjustment |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, amount of hedged item | 0 | 0 |
Fair Value Hedges | Fixed-Rate Debt Obligations |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, amount of hedged item | 18,900 | 11,700 |
Net Investment Hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount of derivatives | 14,300 | 14,100 |
Gain (loss) on net investment hedges, net of taxes | 816 | (640) | 237
Reclassifications out of AOCI | 0 | 0 | 0
Embedded Derivative | Not Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amount of derivatives | 78 | 78 |
Fair value of embedded derivative asset, gross | 31 | 18 |
Embedded Derivative | Noninterest Income | Not Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on embedded derivative | $ 13 | $ (9) | $ 4

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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