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Loans Receivable, Net (Details - Allowance) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Allowance for loan losses, beginning of period   $ 221 $ 353 $ 404
Provision (benefit) for loan losses $ (99) (168) (149) (40)
Charge-offs   (13) (25) (44)
Recoveries   34 42 33
Net (charge-offs) recoveries   21 17 (11)
Allowance for loan losses, end of period   74 221 353
Provision (benefit) for loan losses $ (99) $ (168) $ (149) (40)
Allowance as a percentage of total loans receivable   2.70% 5.80%  
Provision benefit for loan losses due to model refinement   $ 70    
Minimum [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Percentage of converted loans amortizing 12 months or longer 50.00%      
One- To Four-Family [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Allowance for loan losses, beginning of period   45 $ 40 27
Provision (benefit) for loan losses   (29) (2) 15
Charge-offs   0 (1) (2)
Recoveries   8 8 0
Net (charge-offs) recoveries   8 7 (2)
Allowance for loan losses, end of period   24 45 40
Provision (benefit) for loan losses   $ (29) $ (2) 15
Allowance as a percentage of total loans receivable   1.60% 2.30%  
Home Equity [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Allowance for loan losses, beginning of period   $ 171 $ 307 367
Provision (benefit) for loan losses   (141) (148) (55)
Charge-offs   (7) (17) (31)
Recoveries   23 29 26
Net (charge-offs) recoveries   16 12 (5)
Allowance for loan losses, end of period   46 171 307
Provision (benefit) for loan losses   $ (141) $ (148) (55)
Allowance as a percentage of total loans receivable   4.20% 11.00%  
Consumer and other [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Allowance for loan losses, beginning of period   $ 5 $ 6 10
Provision (benefit) for loan losses   2 1 0
Charge-offs   (6) (7) (11)
Recoveries   3 5 7
Net (charge-offs) recoveries   (3) (2) (4)
Allowance for loan losses, end of period   4 5 6
Provision (benefit) for loan losses   $ 2 $ 1 $ 0
Allowance as a percentage of total loans receivable   2.10% 1.90%  
Held-for-investment [Member]        
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Increase (Decrease) in Finance Receivables   $ (900)