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Loans Receivable, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Loans Receivable, Net [Abstract]        
One- to four-family $ 2,370 $ 2,488    
Home equity 1,974 2,114    
Consumer and other 317 341    
Total loans receivable 4,661 4,943    
Unamortized premiums, net 21 23    
Allowance for loan losses (322) (353) $ (402) $ (404)
Total loans receivable, net 4,360 4,613    
Loans Pledged Federal Home Loan Bank 3,900 4,200    
Loans Pledged Federal Reserve Bank 300 300    
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 4,196 4,478    
Loans individually evaluated for impairment, recorded investment 486 488    
Total recorded investment in loans receivable 4,682 4,966    
Loans collectively evaluated for impairment, allowance for loan losses 264 292    
Loans individually evaluated for impairment, allowance for loan losses 58 61    
Allowance for loan losses 322 353 402 404
One- To Four-Family [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (49) (40) (31) (27)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 2,109 2,219    
Loans individually evaluated for impairment, recorded investment 277 286    
Loans collectively evaluated for impairment, allowance for loan losses 41 31    
Loans individually evaluated for impairment, allowance for loan losses 8 9    
Allowance for loan losses 49 40 31 27
Home Equity [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (267) (307) (360) (367)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 1,767 1,915    
Loans individually evaluated for impairment, recorded investment 209 202    
Loans collectively evaluated for impairment, allowance for loan losses 217 255    
Loans individually evaluated for impairment, allowance for loan losses 50 52    
Allowance for loan losses 267 307 360 367
Consumer And Other [Member]        
Loans Receivable, Net [Abstract]        
Allowance for loan losses (6) (6) (11) (10)
Financing Receivable, Allowance for Credit Losses, Additional Information [Line Items]        
Loans collectively evaluated for impairment, recorded investment 320 344    
Loans collectively evaluated for impairment, allowance for loan losses 6 6    
Allowance for loan losses $ 6 $ 6 $ 11 $ 10