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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 129
Due from one to five years	414
Due from five to ten years	1,604
Due after ten years	8,364
Amortized Cost	10,511
Mortgage-Related Debt Securities:
Debt Securities, Available-for-sale [Line Items]
Due within one year	80
Due from one to five years	115
Due from five to ten years	276
Due after ten years	8,437
Amortized Cost	8,908	$ 7,035
U.S. Government agency and GSE obligations
Debt Securities, Available-for-sale [Line Items]
Due within one year	0
Due from one to five years	0
Due from five to ten years	1,502
Due after ten years	0
Amortized Cost	1,502
State, County, and Municipal
Debt Securities, Available-for-sale [Line Items]
Due within one year	0
Due from one to five years	0
Due from five to ten years	6
Due after ten years	0
Amortized Cost	6
Other Debt Securities
Debt Securities, Available-for-sale [Line Items]
Due within one year	50
Due from one to five years	303
Due from five to ten years	101
Due after ten years	285
Amortized Cost	$ 739

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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+ References

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+ References

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+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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