Fair Values of Assets and Liabilities - Fair Value Option (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair value carrying amount, total loans	$ 2,251	$ 2,011
Aggregate unpaid principal, total loans	2,243	1,994
Carrying amount over (under) unpaid principal outstanding, total loans	8	17
Fair value carrying amount, time deposits	5,754	2,818
Aggregate unpaid principal, time deposits	5,762	2,822
Carrying amount over (under) unpaid principal outstanding, time deposits	(8)	(4)
Long-term debt	391	0
Contractual principal outstanding, long-term debt	409	0
Carrying amount over (under) contractual principal outstanding, long-term debt	(18)	0
Fair value, nonaccrual loans	1	1
Contractual principal outstanding, nonaccrual loans	1	1
Fair value, loans 90 days or more past due	4	4
Contractual principal outstanding, loans 90 days or more past due	$ 4	$ 4

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

+ References

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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.

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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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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair value portion of mortgage loans held-for-sale.

+ References

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Fair Value Option Loans Held As Assets Aggregate Amount In Nonaccrual Status Aggregate Unpaid Principal

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Fair Value Option Loans Held As Assets Aggregate Unpaid Principal

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Fair Value Option Loans Held As Assets 90 Days Or More Past Due Aggregate Unpaid Principal

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Fair Value Option, Long-Term Debt, Contractual Principal Outstanding

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Fair value option time deposits carrying amount over under contractual principal outstanding.

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Fair value option time deposits contractual principal outstanding.

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