Fair Value Option - Aggregate Differences (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Long-term beneficial interests
Performing loans, ninety days or more past due	$ 0	$ 0
Lending-related commitments, fair value option elected
Long-term beneficial interests
Contractual amount of lending-related commitments	26,000,000,000.0	18,900,000,000
Contractual lending-related commitments, fair value	57,000,000	42,000,000
Contractual principal outstanding
Loans
Nonaccrual loans	5,433,000,000	5,437,000,000
All other performing loans	77,390,000,000	83,654,000,000
Total loans	83,028,000,000	89,243,000,000
Contractual principal outstanding \| Principal-protected debt
Long-term debt
Total long-term debt	91,759,000,000	73,984,000,000
Contractual principal outstanding \| Loans reported as trading assets
Loans
Nonaccrual loans	3,761,000,000	3,443,000,000
All other performing loans	15,258,000,000	14,852,000,000
Contractual principal outstanding \| Loans
Loans
Nonaccrual loans	1,672,000,000	1,994,000,000
90 or more days past due and government guaranteed	205,000,000	152,000,000
All other performing loans	62,132,000,000	68,802,000,000
Fair value
Loans
Nonaccrual loans	1,990,000,000	2,063,000,000
All other performing loans	74,940,000,000	81,402,000,000
Total loans	77,126,000,000	83,609,000,000
Long-term debt
Total long-term debt	156,056,000,000	134,559,000,000
Long-term beneficial interests
Total long-term beneficial interests	5,000,000	5,000,000
Fair value \| Principal-protected debt
Long-term debt
Total long-term debt	79,494,000,000	63,770,000,000
Fair value \| Nonprincipal-protected debt
Long-term debt
Total long-term debt	76,562,000,000	70,789,000,000
Long-term beneficial interests
Total long-term beneficial interests	5,000,000	5,000,000
Fair value \| Loans reported as trading assets
Loans
Nonaccrual loans	756,000,000	545,000,000
All other performing loans	13,481,000,000	12,380,000,000
Fair value \| Loans
Loans
Nonaccrual loans	1,234,000,000	1,518,000,000
90 or more days past due and government guaranteed	196,000,000	144,000,000
All other performing loans	61,459,000,000	69,022,000,000
Fair value over/(under) contractual principal outstanding
Loans
Nonaccrual loans, Fair value over/(under) contractual principal outstanding	(3,443,000,000)	(3,374,000,000)
All other performing loans	(2,450,000,000)	(2,252,000,000)
Total loans	(5,902,000,000)	(5,634,000,000)
Fair value over/(under) contractual principal outstanding \| Principal-protected debt
Long-term debt
Long-term debt, Fair value over/(under) contractual principal outstanding	(12,265,000,000)	(10,214,000,000)
Fair value over/(under) contractual principal outstanding \| Loans reported as trading assets
Loans
Nonaccrual loans, Fair value over/(under) contractual principal outstanding	(3,005,000,000)	(2,898,000,000)
All other performing loans	(1,777,000,000)	(2,472,000,000)
Fair value over/(under) contractual principal outstanding \| Loans
Loans
Nonaccrual loans, Fair value over/(under) contractual principal outstanding	(438,000,000)	(476,000,000)
90 or more days past due and government guaranteed, Fair value over/(under) contractual principal outstanding	(9,000,000)	(8,000,000)
All other performing loans	$ (673,000,000)	$ 220,000,000

Represents the portion of loans held as assets for which the fair value option has been elected, valued at fair value.

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- Definition

Fair Value Options Other Performing Loans.

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- Definition

Guarantor Obligations, Net Of Other Commitments, Current Carrying Value

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- Definition

Long Term Beneficial Interests.

+ References

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Long term beneficial interests.

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- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

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For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due.

+ References

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This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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