Loans Receivable, Net (Details - TDRs Accrual and Nonaccrual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	$ 325	$ 378
Financing Receivable, Troubled Debt Restructurings, Modifications, Total1	253	285
Financing Receivable, Troubled Debt Restructurings, Bankruptcy Notifications	72	93
Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	177	187
Nonperforming Financial Instruments [Member] | FinancingReceivablesNonAccrualCurrent [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	84	108
Nonperforming Financial Instruments [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	20	23
Nonperforming Financial Instruments [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	9	9
Nonperforming Financial Instruments [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	35	51
One- To Four-Family [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	187	213
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	55	67
One- To Four-Family [Member] | Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	87	83
One- To Four-Family [Member] | Nonperforming Financial Instruments [Member] | FinancingReceivablesNonAccrualCurrent [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	61	74
One- To Four-Family [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	12	13
One- To Four-Family [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	4	5
One- To Four-Family [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	23	38
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	138	165
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	121	144
Home Equity [Member] | Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	90	104
Home Equity [Member] | Nonperforming Financial Instruments [Member] | FinancingReceivablesNonAccrualCurrent [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	23	34
Home Equity [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	8	10
Home Equity [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	5	4
Home Equity [Member] | Nonperforming Financial Instruments [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment in TDRs	$ 12	$ 13