Loans Receivable, Net (Details - Modifications Types and Financial Impact) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	7	16	19	36
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 2	$ 3	$ 5	$ 6
Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	1	1	4	3
Other without Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 2	$ 1	$ 3
One- To Four-Family [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	6	7	10	16
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 2	$ 3	$ 4	$ 5
One- To Four-Family [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	1	1	3	2
One- To Four-Family [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 2	$ 1	$ 3
Home Equity [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	1	9	9	20
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 1	$ 1
Home Equity [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	0	1	1
Home Equity [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 0