Derivatives (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
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| Derivative Instrument Detail [Abstract] | ||
| Hedging exposure to variability in future cash flows for specific length of time | 3 years | 3 years |
| Accumulated Other Comprehensive Income Loss | $ 208 | $ (147) |
| Deferred net gains (losses) expected to be reclassified to earnings | 326 | |
| Excess cash collateral received on derivatives | 34 | $ 4 |
| Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged | $ 0 |
| X | ||||||||||
- Definition Accumulated other comprehensive income (loss) related to the effective portion of derivatives designated in cash flow hedges. No definition available.
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it has sold or re-pledged to counterparties as collateral. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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