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Loans Receivable, Net (Details - Credit Quality) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Credit Quality Indicators [Line Items]    
Average Age, Financing Receivable 11 years 9 months 18 days 10 years 9 months 29 days
Greater Than 10% of Loans, States Other than California, Count 0 0
One- To Four-Family [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable $ 1,432 $ 1,950
Average estimated current LTV/CLTV 70.00% 73.00%
Average LTV/CLTV at loan origination 71.00% 71.00%
One- To Four-Family [Member] | FICO Score, Greater than 720 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable $ 805 $ 1,121
One- To Four-Family [Member] | FICO Score, 719 to 700 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 138 179
One- To Four-Family [Member] | FICO Score, 699 to 680 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 105 153
One- To Four-Family [Member] | FICO Score, 679 to 660 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 78 121
One- To Four-Family [Member] | FICO Score, 659 to 620 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 122 154
One- To Four-Family [Member] | FICO Score, Less than 620 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 184 222
One- To Four-Family [Member] | LTV Less than 80 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 1,031 1,308
One- To Four-Family [Member] | LTV 80 to 100 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 256 413
One- To Four-Family [Member] | LTV 100 to 120 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 91 143
One- To Four-Family [Member] | LTV Greater than 120 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 54 86
Home Equity [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable $ 1,097 $ 1,556
Average estimated current LTV/CLTV 84.00% 87.00%
Average LTV/CLTV at loan origination 81.00% 81.00%
Home Equity [Member] | FICO Score, Greater than 720 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable $ 548 $ 778
Home Equity [Member] | FICO Score, 719 to 700 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 106 156
Home Equity [Member] | FICO Score, 699 to 680 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 93 141
Home Equity [Member] | FICO Score, 679 to 660 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 79 117
Home Equity [Member] | FICO Score, 659 to 620 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 103 149
Home Equity [Member] | FICO Score, Less than 620 [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 168 215
Home Equity [Member] | LTV Less than 80 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 531 686
Home Equity [Member] | LTV 80 to 100 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 291 414
Home Equity [Member] | LTV 100 to 120 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable 176 274
Home Equity [Member] | LTV Greater than 120 Percent [Member]    
Credit Quality Indicators [Line Items]    
Total mortgage loans receivable $ 99 $ 182
One- To Four-Family and Home Equity Benchmark [Member] | Financing Receivables, State, Risk [Member] | CALIFORNIA    
Credit Quality Indicators [Line Items]    
Concentration Risk, Percentage 34.00% 36.00%
Home Equity Line of Credit Benchmark [Member] | Interest only, Already Amortizing | Maximum [Member]    
Credit Quality Indicators [Line Items]    
Concentration Risk, Percentage 100.00%  
One- To Four-Family Benchmark [Member] | Interest only, Already Amortizing | Maximum [Member]    
Credit Quality Indicators [Line Items]    
Concentration Risk, Percentage 100.00%