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Loans Receivable, Net (Details - Allowance Evaluation for Impairment) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment $ 2,350 $ 3,331    
Loans individually evaluated for impairment, recorded investment 378 441    
Total recorded investment in loans receivable 2,728 3,772    
Loans collectively evaluated for impairment, allowance for loan losses 39 163    
Loans individually evaluated for impairment, allowance for loan losses 35 58    
Allowance for loan losses 74 221 $ 353 $ 404
One- To Four-Family [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 1,228 1,717    
Loans individually evaluated for impairment, recorded investment 213 246    
Loans collectively evaluated for impairment, allowance for loan losses 18 38    
Loans individually evaluated for impairment, allowance for loan losses 6 7    
Allowance for loan losses 24 45 40 27
Home Equity [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 932 1,361    
Loans individually evaluated for impairment, recorded investment 165 195    
Loans collectively evaluated for impairment, allowance for loan losses 17 120    
Loans individually evaluated for impairment, allowance for loan losses 29 51    
Allowance for loan losses 46 171 307 367
Consumer and other [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 190 253    
Loans collectively evaluated for impairment, allowance for loan losses 4 5    
Allowance for loan losses $ 4 $ 5 $ 6 $ 10