Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,093	$ 1,112
Aggregate unpaid principal balance of assets for which fair value option was elected	1,270	1,295
Fair value option aggregate difference assets	(177)	(183)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	142	162
Aggregate unpaid principal balance of assets for which fair value option was elected	126	154
Fair value option aggregate difference assets	16	8
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	37	31
Aggregate unpaid principal balance, other borrowed funds	38	32
Difference, Other borrowed funds	(1)	(1)
Other Liabilities With Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	30	23
Aggregate unpaid principal balance, other borrowed funds	33	25
Difference, Other borrowed funds	(3)	(2)
Other Liabilities Without Contractual Unpaid Principal Balance
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	110	122
Aggregate unpaid principal balance, other borrowed funds	0	0
Difference, Other borrowed funds	110	122
Interest-bearing deposits
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	783	3,642
Aggregate unpaid principal balance, other borrowed funds	784	3,641
Difference, Other borrowed funds	(1)	1
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	695	716
Aggregate unpaid principal balance of assets for which fair value option was elected	774	796
Fair value option aggregate difference assets	(79)	(80)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	182	159
Aggregate unpaid principal balance of assets for which fair value option was elected	195	172
Fair value option aggregate difference assets	(13)	(13)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	216	237
Aggregate unpaid principal balance of assets for which fair value option was elected	301	327
Fair value option aggregate difference assets	(85)	(90)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	747	660
Aggregate unpaid principal balance of assets for which fair value option was elected	743	656
Fair value option aggregate difference assets	4	4
Residential mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	726	641
Aggregate unpaid principal balance of assets for which fair value option was elected	720	636
Fair value option aggregate difference assets	6	5
Residential mortgage loans held for sale \| Accruing loans 90 days or more past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	8	5
Aggregate unpaid principal balance of assets for which fair value option was elected	8	5
Fair value option aggregate difference assets	0	0
Residential mortgage loans held for sale \| Nonaccrual loans \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	13	14
Aggregate unpaid principal balance of assets for which fair value option was elected	15	15
Fair value option aggregate difference assets	(2)	(1)
Commercial mortgage loans held for sale \| Accruing loans less than 90 days past due \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	558	1,059
Aggregate unpaid principal balance of assets for which fair value option was elected	555	1,059
Fair value option aggregate difference assets	$ 3	$ 0

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- Definition

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+ References

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- Definition

Represents the fair value of assets for which the fair value option was elected.

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For assets for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets.

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- Definition

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