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Loans Receivable, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans Receivable, Net [Abstract]        
One- to four-family $ 2,488 $ 3,060    
Home equity 2,114 2,834    
Consumer and other 341 455    
Total loans receivable 4,943 6,349    
Unamortized premiums, net 23 34    
Allowance for loan losses (353) (404) $ (453) $ (481)
Total loans receivable, net 4,613 5,979    
Loans Pledged Federal Home Loan Bank 4,200 5,400    
Loans Pledged Federal Reserve Bank 300 500    
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 4,478 5,850    
Loans individually evaluated for impairment, recorded investment 488 533    
Total recorded investment in loans receivable 4,966 6,383    
Loans collectively evaluated for impairment, allowance for loan losses 292 338    
Loans individually evaluated for impairment, allowance for loan losses 61 66    
Allowance for loan losses 353 404 453 481
One- To Four-Family [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (40) (27) (102) (184)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 2,219 2,764    
Loans individually evaluated for impairment, recorded investment 286 316    
Loans collectively evaluated for impairment, allowance for loan losses 31 18    
Loans individually evaluated for impairment, allowance for loan losses 9 9    
Allowance for loan losses 40 27 102 184
Home Equity [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (307) (367) (326) (257)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 1,915 2,625    
Loans individually evaluated for impairment, recorded investment 202 217    
Loans collectively evaluated for impairment, allowance for loan losses 255 310    
Loans individually evaluated for impairment, allowance for loan losses 52 57    
Allowance for loan losses 307 367 326 257
Consumer And Other [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (6) (10) (25) (40)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 344 461    
Loans collectively evaluated for impairment, allowance for loan losses 6 10    
Allowance for loan losses $ 6 $ 10 $ 25 $ 40