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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) $ in Millions	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 508
Due from one to five years	776
Due from five to ten years	1,714
Due after ten years	5,725
Debt securities, available-for-sale, amortized cost, total	8,723
Agency - commercial
Debt Securities, Available-for-sale [Line Items]
Due within one year	20
Due from one to five years	179
Due from five to ten years	319
Due after ten years	5,920
Debt securities, available-for-sale, amortized cost, total	6,438
U.S. Government agency and GSE obligations
Debt Securities, Available-for-sale [Line Items]
Due within one year	492
Due from one to five years	150
Due from five to ten years	1,427
Due after ten years	167
Debt securities, available-for-sale, amortized cost, total	2,236
US States and Political Subdivisions Debt Securities
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	7
Due after ten years	0
Debt securities, available-for-sale, amortized cost, total	7
Other Debt Obligations
Debt Securities, Available-for-sale [Line Items]
Due within one year	0
Due from one to five years	457
Due from five to ten years	407
Due after ten years	356
Debt securities, available-for-sale, amortized cost, total	$ 1,220

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- 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).

+ References

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-SubTopic 210
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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