Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	$ 1,118	$ 1,112
Aggregate unpaid principal balance of assets for which fair value option was elected	1,298	1,295
Fair value option aggregate difference assets	(180)	(183)
Other assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	135	162
Aggregate unpaid principal balance of assets for which fair value option was elected	131	154
Fair value option aggregate difference assets	4	8
Other borrowed funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	34	31
Aggregate unpaid principal balance, other borrowed funds	35	32
Difference, Other borrowed funds	(1)	(1)
Fair Value Of Liabilities For Which Fair Value Option Was Elected	34	31
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	23	23
Aggregate unpaid principal balance, other borrowed funds	25	25
Difference, Other borrowed funds	(2)	(2)
Fair Value Of Liabilities For Which Fair Value Option Was Elected	23	23
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	126	122
Aggregate unpaid principal balance, other borrowed funds	0	0
Difference, Other borrowed funds	126	122
Fair Value Of Liabilities For Which Fair Value Option Was Elected	126	122
Interest-bearing deposits
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value of liabilities for which fair value option was elected	728	3,642
Aggregate unpaid principal balance, other borrowed funds	729	3,641
Difference, Other borrowed funds	(1)	1
Fair Value Of Liabilities For Which Fair Value Option Was Elected	728	3,642
Accruing loans less than 90 days past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	704	716
Aggregate unpaid principal balance of assets for which fair value option was elected	785	796
Fair value option aggregate difference assets	(81)	(80)
Accruing loans 90 days or more past due \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	190	159
Aggregate unpaid principal balance of assets for which fair value option was elected	202	172
Fair value option aggregate difference assets	(12)	(13)
Nonaccrual loans \| Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	224	237
Aggregate unpaid principal balance of assets for which fair value option was elected	311	327
Fair value option aggregate difference assets	(87)	(90)
Residential mortgage loans held for sale \| Loans held for sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value - assets	582	660
Aggregate unpaid principal balance of assets for which fair value option was elected	585	656
Fair value option aggregate difference assets	(3)	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	562	641
Aggregate unpaid principal balance of assets for which fair value option was elected	563	636
Fair value option aggregate difference assets	(1)	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	6	5
Aggregate unpaid principal balance of assets for which fair value option was elected	6	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	14	14
Aggregate unpaid principal balance of assets for which fair value option was elected	16	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	620	1,059
Aggregate unpaid principal balance of assets for which fair value option was elected	617	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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Represents the fair value of liabilities 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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