Loans Receivable, Net (Details - TDRs Specific Valuation Allowance) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Impaired Financing Receivable With And With No Related Allowance [Line Items]
Recorded Investment in TDRs	$ 378	$ 441
Specific valuation allowance	35	58
One- To Four-Family [Member]
Impaired Financing Receivable With And With No Related Allowance [Line Items]
Impaired Financing Receivable, With Related Allowance, Recorded Investment	54	61
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	159	185
Recorded Investment in TDRs	213	246
Specific valuation allowance	6	7
Impaired Financing Receivable, with Related Allowance, Net Investment	48	54
Impaired Financing Receivable, with No Related Allowance, Net Investment	159	185
Impaired Financing Receivables, Net Investment, Total	207	239
Home Equity [Member]
Impaired Financing Receivable With And With No Related Allowance [Line Items]
Impaired Financing Receivable, With Related Allowance, Recorded Investment	83	111
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	82	84
Recorded Investment in TDRs	165	195
Specific valuation allowance	29	51
Impaired Financing Receivable, with Related Allowance, Net Investment	54	60
Impaired Financing Receivable, with No Related Allowance, Net Investment	82	84
Impaired Financing Receivables, Net Investment, Total	$ 136	$ 144

Amount of net investment in impaired financing receivables for which there is no related allowance for credit losses.

No definition available.

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- Definition

Amount of net investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

No definition available.

+ Details

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- Definition

Amounf of net investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

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- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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