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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Pre-tax AOCI loss | $ (3,053,000,000) | $ (3,912,000,000) | $ (4,325,000,000) | $ (3,773,000,000)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax | 19,000,000 |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | (168,000,000) |  |  |
Pre-tax net income related to amortization of discontinued cash flow hedges | 20,000,000 |  |  |
Derivative, Notional Amount | 165,933,000,000 | 163,738,000,000 |  |
Maximum potential future exposure on swap participations | 418,000,000 |  |  |
Aggregate fair value of all derivative instruments with credit risk | 57,000,000 | 47,000,000 |  |
Posted collateral related to derivative instruments with credit risk | 50,000,000 | 34,000,000 |  |
Unrealized gains (losses) on derivative instruments designated as cash flow hedges: |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Pre-tax AOCI loss | (323,000,000) |  |  |
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 121,464,000,000 | 119,594,000,000 |  |
Interest Rate Lock Commitments | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 194,000,000 | 117,000,000 |  |
Forward Sale Commitments | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | 368,000,000 | 308,000,000 |  |
Forward Rate Commitments and Futures Contracts | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount | $ 3,900,000,000 | $ 3,400,000,000 |  |

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- Definition Amounts included in Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax + References No definition available. + Details
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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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- Definition The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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