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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2021
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	$ 23	$ 27
Impaired loans with no related allowance, Interest Income Recognized	1
Impaired loans with an allowance recorded, Recorded Investment	15	5
Impaired loans with an allowance recorded, Related Allowance	1	1
Total impaired loans, Recorded Investment	38	32
Total impaired loans, Interest Income Recognized	1
Multi-Family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment		7
Impaired loans with an allowance recorded, Recorded Investment	4	2
Impaired loans with an allowance recorded, Related Allowance	1	1
Total impaired loans, Recorded Investment	4	9
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	2	11
Impaired loans with an allowance recorded, Recorded Investment	10	1
Total impaired loans, Recorded Investment	12	12
One-to-Four Family
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	1
Impaired loans with an allowance recorded, Recorded Investment	1	2
Total impaired loans, Recorded Investment	2	2
Other Loans
Financing Receivable, Impaired [Line Items]
Impaired loans with no related allowance, Recorded Investment	20	9
Impaired loans with no related allowance, Interest Income Recognized	1
Total impaired loans, Recorded Investment	20	$ 9
Total impaired loans, Interest Income Recognized	$ 1

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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.

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

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