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Fair Value Disclosures (Details - FV of Financial Instruments) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 436			$ 750	$ 380
Cash and investments segregated under federal or other regulations	2,970				948
Total held-to-maturity securities	27,182			21,969
Margin receivables	9,422			9,675
Total loans receivable, net	1,608			1,595
Receivables from brokers, dealers and clearing organizations	1,128			1,395
Deposits	43,667			38,606
Customer payables	15,671			12,849
Payables to brokers, dealers and clearing organizations	1,524			893
Corporate debt	1,412			1,410
Disclosure Endnotes [Abstract]
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	12,800			14,000
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged	3,200			2,100
Loans and Leases Receivable, Allowance	82	$ 86		(17)	(30)	$ (32)	$ (37)
Securities purchased under agreement to resell	2,600			200
Securities borrowed	634			1,116
Securities purchased under agreement to resell, fair value of collateral	2,600			206
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	436			750
Cash and investments segregated under federal or other regulations	5,570			1,879
Total held-to-maturity securities	27,182			21,969
Margin receivables	9,422			9,675
Total loans receivable, net	1,608			1,595
Receivables from brokers, dealers and clearing organizations	1,128			1,395
Other assets	204			313
Deposits	43,667			38,606
Customer payables	15,671			12,849
Payables to brokers, dealers and clearing organizations	1,524			893
Corporate debt	1,412			1,410
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	436			750
Cash and investments segregated under federal or other regulations	5,570			1,879
Total held-to-maturity securities	28,096			22,246
Margin receivables	9,422			9,675
Total loans receivable, net	1,613			1,663
Receivables from brokers, dealers and clearing organizations	1,128			1,395
Other assets	204			313
Deposits	43,667			38,605
Customer payables	15,671			12,849
Payables to brokers, dealers and clearing organizations	1,524			893
Corporate debt	1,546			1,485
One- To Four-Family [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	754			802
Disclosure Endnotes [Abstract]
Loans and Leases Receivable, Allowance	36	35	$ 37	(6)	(9)	(9)	(9)
One- To Four-Family [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	754			802
One- To Four-Family [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	759			835
Home Equity [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	596			624
Disclosure Endnotes [Abstract]
Loans and Leases Receivable, Allowance	46	$ 51	$ 60	(11)	(19)	(21)	(26)
Home Equity [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	596			624
Home Equity [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	596			659
Consumer and other [Member]
Disclosure Endnotes [Abstract]
Loans and Leases Receivable, Allowance					$ (2)	$ (2)	$ (2)
Securities-based lending [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	258			169
Disclosure Endnotes [Abstract]
Loans and Leases Receivable, Allowance	0			0
Securities-based lending [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	258			169
Securities-based lending [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	258			169
Fully paid lending program [Member]
Disclosure Endnotes [Abstract]
Securities borrowed				113
Agency mortgage-backed securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	25,579			20,085
Agency mortgage-backed securities [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	25,579			20,085
Agency mortgage-backed securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	26,415			20,329
Agency debentures [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	208			267
Agency debentures [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	208			267
Agency debentures [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	219			271
Other agency debt securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,395			1,617
Other agency debt securities [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,395			1,617
Other agency debt securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,462			1,646
Level 1 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	436			750
Cash and investments segregated under federal or other regulations	2,970			1,879
Level 2 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	28,096			22,246
Margin receivables	9,422			9,675
Total loans receivable, net	258			169
Receivables from brokers, dealers and clearing organizations	1,128			1,395
Other assets	204			313
Deposits	43,667			38,605
Customer payables	15,671			12,849
Payables to brokers, dealers and clearing organizations	1,524			893
Corporate debt	1,546			1,485
Level 2 [Member] \| Securities-based lending [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	258			169
Level 2 [Member] \| Agency mortgage-backed securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	26,415			20,329
Level 2 [Member] \| Agency debentures [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	219			271
Level 2 [Member] \| Other agency debt securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,462			1,646
Level 2 [Member] \| Securities Purchased under Agreements to Resell [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and investments segregated under federal or other regulations	2,600
Level 3 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,355			1,494
Level 3 [Member] \| One- To Four-Family [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	759			835
Level 3 [Member] \| Home Equity [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	$ 596			$ 659