Loans Receivable, Net (Details - Modifications Types and Financial Impact) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan	Dec. 31, 2013 USD ($) loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	401	259	577
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 37	$ 35	$ 145
Less than [Member]
Financing Receivable, Modifications [Line Items]
Financial Impact, Troubled Debt Restructurings - Modifications, Principal Forgiven	1	1
Principal Forgiveness with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1	19
Principal Deferral with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	0	5
Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	12	15	78
Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2	4	18
Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 22	$ 15	$ 25
One- To Four-Family [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	34	64	324
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 13	$ 20	$ 124
Financial Impact, Troubled Debt Restructurings - Modifications, Principal Forgiven			$ 7
Financial Impact, Troubled Debt Restructurings - Modifications, Pre-Modification Weighted Average Interest Rate			5.20%
Financial Impact, Troubled Debt Restructurings - Modifications, Post-Modification Weighted Average Interest Rate			2.30%
One- To Four-Family [Member] | Principal Forgiveness with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1	$ 19
One- To Four-Family [Member] | Principal Deferral with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	1	0	5
One- To Four-Family [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	9	11	71
One- To Four-Family [Member] | Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	2	11
One- To Four-Family [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3	$ 6	$ 18
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts | loan	367	195	253
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 24	$ 15	$ 21
Home Equity [Member] | Principal Forgiveness with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0	0
Home Equity [Member] | Principal Deferral with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0	0
Home Equity [Member] | Re-Age Extension or Interest Capitalization with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	3	4	7
Home Equity [Member] | Other with Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	2	2	7
Home Equity [Member] | Other without Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 19	$ 9	$ 7