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Financial Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Derivative [Line Items] |  |
Cash and securities held to collateralize net derivative assets | $ 1,500,000,000 |
Cash and securities pledged to collateralize net derivative liabilities | 4,400,000,000 |
Cash flow hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Cash flow hedge gain (loss) to be reclassified within twelve months | 300,000,000 |
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax | $ 231,000,000 |
Maximum length of time hedged in cash flow hedge | 10 years |
Net investment hedges | Foreign exchange contracts: |  |
Derivative [Line Items] |  |
Gain loss from components excluded from assessment of net investment hedge effectiveness net | $ 0 | $ 0

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- Definition Represents amount of cash, and if applicable, U.S. government securities and/or mortgage-backed securities, held under master netting and other collateral agreements to collateralize net derivative assets due from counterparties. + References No definition available. + Details
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- Definition Represents amount of cash, and if applicable, U.S. government securities and/or mortgage-backed securities, pledged under master netting and other collateral agreements to collateralize net derivative liabilities owed to counterparties. + References No definition available. + Details
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- Definition Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax + References No definition available. + Details
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- Definition Gain Loss From Components Excluded From Assessment Of Net Investment Hedge Effectiveness Net + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + 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 Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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