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Loans Receivable, Net (Details - Allowance Evaluation for Impairment) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment $ 1,332 $ 1,815    
Loans individually evaluated for impairment, recorded investment 280 325    
Total recorded investment in loans receivable 1,612 2,140    
Loans collectively evaluated for impairment, allowance for loan losses 2 13    
Loans individually evaluated for impairment, allowance for loan losses 15 24    
Allowance for loan losses 17 37 $ 74 $ 221
One- To Four-Family [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 640 891    
Loans individually evaluated for impairment, recorded investment 168 187    
Loans collectively evaluated for impairment, allowance for loan losses 1 4    
Loans individually evaluated for impairment, allowance for loan losses 5 5    
Allowance for loan losses 6 9 24 45
Home Equity [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 523 698    
Loans individually evaluated for impairment, recorded investment 112 138    
Loans collectively evaluated for impairment, allowance for loan losses 1 7    
Loans individually evaluated for impairment, allowance for loan losses 10 19    
Allowance for loan losses 11 26 46 171
Consumer and other [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 0 119    
Loans collectively evaluated for impairment, allowance for loan losses 0 2    
Allowance for loan losses 0 2 $ 4 $ 5
Securities-based lending [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 169 107    
Loans collectively evaluated for impairment, allowance for loan losses 0 0    
Allowance for loan losses $ 0 $ 0