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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 43	$ 29
Impaired loans with no related allowance, Interest Income Recognized	1	1
Impaired loans with an allowance recorded, Recorded Investment	2	4
Total impaired loans, Recorded Investment	45	33
Total impaired loans, Interest Income Recognized	1	1
Multi-Family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	13	9
Impaired loans with no related allowance, Interest Income Recognized		1
Impaired loans with an allowance recorded, Recorded Investment		1
Total impaired loans, Recorded Investment	13	10
Total impaired loans, Interest Income Recognized		1
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	27	14
Impaired loans with no related allowance, Interest Income Recognized	1
Impaired loans with an allowance recorded, Recorded Investment		2
Total impaired loans, Recorded Investment	28	16
Total impaired loans, Interest Income Recognized	1
One-to-Four Family
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded, Recorded Investment	1	1
Total impaired loans, Recorded Investment		1
Acquisition, Development, and Construction
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment
Total impaired loans, Recorded Investment
Other Loans
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	3	6
Total impaired loans, Recorded Investment	$ 3	$ 6

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
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-Topic 310
-SubTopic 10
-Section 50
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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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