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Loans Receivable, Net (Details - TDRs Average Investment and Income) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
TDRs, Average Recorded Investment $ 400 $ 473 $ 516
TDRs, Interest Income Recognized 25 28 26
One- To Four-Family [Member]      
Financing Receivable, Impaired [Line Items]      
TDRs, Average Recorded Investment 221 269 303
TDRs, Interest Income Recognized 9 11 9
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
TDRs, Average Recorded Investment 179 204 213
TDRs, Interest Income Recognized $ 16 $ 17 $ 17