Loans Receivable, Net (Details - Aging) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Cumulative Effect on Retained Earnings, before Tax			$ (114)
Financing Receivable, Past Due [Line Items]
Loans receivable, Current	$ 1,381		1,381				$ 1,477
Total mortgage loans receivable	1,522		1,522				1,607
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	4		4				5
Loans and Leases Receivable, Allowance	82	$ (30)	82	$ (30)	$ 86		(17)	$ (32)	$ (37)
Total loans receivable, net	1,608		1,608				1,595
Loans Receivable, Net [Abstract]
Loans Pledged Federal Home Loan Bank	$ 900		$ 900				1,200
Percentage Increase (Decrease) in Finance Receivables	(5.00%)		(5.00%)
Total mortgage loans receivable	$ 1,522		$ 1,522				1,607
Percentage increase (decrease) in loans net	1.00%		1.00%
Total loans receivable, net	$ 1,608		$ 1,608				$ 1,595
Allowance as a percentage of total loans receivable							(1.10%)
Provision (benefit) for credit losses	(1)	(8)	5	(20)
Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	64		64				$ 60
Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	29		29				18
Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	48		48				52
E TRADE Line of Credit
Line of Credit Facility [Line Items]
Unused Commitments to Extend Credit	1,100		1,100				431
Accounting Standards Update 2016-13 [Member]
Line of Credit Facility [Line Items]
Cumulative effect of accounting change	84
Cumulative Effect on Retained Earnings, before Tax	114
One- To Four-Family [Member]
Line of Credit Facility [Line Items]
Cumulative Effect on Retained Earnings, before Tax			(43)
Financing Receivable, Past Due [Line Items]
Loans receivable, Current	614		614				718
Total mortgage loans receivable	714		714				803
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	4		4				5
Loans and Leases Receivable, Allowance	36	(9)	36	(9)	35	$ 37	(6)	(9)	(9)
Total loans receivable, net	754		754				802
Loans Receivable, Net [Abstract]
Total mortgage loans receivable	714		714				803
Total loans receivable, net	754		754				802
Provision (benefit) for credit losses	(1)	(1)	0	(3)
One- To Four-Family [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	47		47				39
One- To Four-Family [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	20		20				11
One- To Four-Family [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	33		33				35
Home Equity [Member]
Line of Credit Facility [Line Items]
Cumulative Effect on Retained Earnings, before Tax			(71)
Financing Receivable, Past Due [Line Items]
Loans receivable, Current	509		509				590
Total mortgage loans receivable	550		550				635
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	0		0				0
Loans and Leases Receivable, Allowance	46	(19)	46	(19)	$ 51	$ 60	(11)	$ (21)	$ (26)
Total loans receivable, net	596		596				624
Loans Receivable, Net [Abstract]
Total mortgage loans receivable	550		550				635
Total loans receivable, net	596		596				624
Provision (benefit) for credit losses	0	$ (8)	5	$ (18)
Home Equity [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	17		17				21
Home Equity [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	9		9				7
Home Equity [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	15		15				17
Securities-based lending [Member]
Financing Receivable, Past Due [Line Items]
Loans receivable, Current	258		258				169
Total mortgage loans receivable	258		258				169
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	0		0				0
Loans and Leases Receivable, Allowance	0		0				0
Total loans receivable, net	258		258				169
Loans Receivable, Net [Abstract]
Total mortgage loans receivable	258		258				169
Total loans receivable, net	258		258				169
Securities-based lending [Member] | Financing Receivables, 30 To 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0		0				0
Securities-based lending [Member] | Financing Receivables, 90 To 179 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0		0				0
Securities-based lending [Member] | Financing Receivables, Equal to Greater than 180 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 0		$ 0				$ 0