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Fair Value Disclosures (Details - FV of Financial Instruments) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 750	$ 2,333	$ 931
Cash segregated under federal or other regulations	1,879	1,011	872
Total held-to-maturity securities	21,969	21,884
Margin receivables	9,675	9,560
Total loans receivable, net	1,595	2,103
Receivables from brokers, dealers and clearing organizations	1,395	760
Deposits	38,606	45,313
Customer payables	12,849	10,117
Payables to brokers, dealers and clearing organizations	893	948
Corporate debt	1,410	1,409
Disclosure Endnotes [Abstract]
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	14,000	12,900
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged	2,100	2,300
Allowance for loan losses	17	37	74	$ 221
Securities purchased under agreement to resell	200
Securities borrowed	1,116	176
Securities purchased under agreement to resell, fair value of collateral	206
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	750	2,333
Cash segregated under federal or other regulations	1,879	1,011
Total held-to-maturity securities	21,969	21,884
Margin receivables	9,675	9,560
Total loans receivable, net	1,595	2,103
Receivables from brokers, dealers and clearing organizations	1,395	760
Other assets	313	36
Deposits	38,606	45,313
Customer payables	12,849	10,117
Payables to brokers, dealers and clearing organizations	893	948
Corporate debt	1,410	1,409
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	750	2,333
Cash segregated under federal or other regulations	1,879	1,011
Total held-to-maturity securities	22,246	21,491
Margin receivables	9,675	9,560
Total loans receivable, net	1,663	2,146
Receivables from brokers, dealers and clearing organizations	1,395	760
Other assets	313	36
Deposits	38,605	45,313
Customer payables	12,849	10,117
Payables to brokers, dealers and clearing organizations	893	948
Corporate debt	1,485	1,372
One- To Four-Family [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	802	1,069
Disclosure Endnotes [Abstract]
Allowance for loan losses	6	9	24	45
One- To Four-Family [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	802	1,069
One- To Four-Family [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	835	1,099
Home Equity [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	624	810
Disclosure Endnotes [Abstract]
Allowance for loan losses	11	26	46	171
Home Equity [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	624	810
Home Equity [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	659	825
Consumer and other [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net		117
Disclosure Endnotes [Abstract]
Allowance for loan losses	0	2	$ 4	$ 5
Consumer and other [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net		117
Consumer and other [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net		115
Securities-based lending [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	169	107
Disclosure Endnotes [Abstract]
Allowance for loan losses	0	0
Securities-based lending [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	169	107
Securities-based lending [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	169	107
Fully paid lending program [Member]
Disclosure Endnotes [Abstract]
Securities borrowed	113	36
Agency mortgage-backed securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	20,085	18,085
Agency mortgage-backed securities [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	20,085	18,085
Agency mortgage-backed securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	20,329	17,748
Agency debentures [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	267	1,824
Agency debentures [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	267	1,824
Agency debentures [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	271	1,808
Other agency debt securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,617	1,975
Other agency debt securities [Member] \| Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,617	1,975
Other agency debt securities [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	1,646	1,935
Level 1 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	750	2,333
Cash segregated under federal or other regulations	1,879	1,011
Level 2 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	22,246	21,491
Margin receivables	9,675	9,560
Total loans receivable, net	169	107
Receivables from brokers, dealers and clearing organizations	1,395	760
Other assets	313	36
Deposits	38,605	45,313
Customer payables	12,849	10,117
Payables to brokers, dealers and clearing organizations	893	948
Corporate debt	1,485	1,372
Level 2 [Member] \| Securities-based lending [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	169	107
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	20,329	17,748
Level 2 [Member] \| Agency debentures [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	271	1,808
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	1,646	1,935
Level 3 [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,494	2,039
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	835	1,099
Level 3 [Member] \| Home Equity [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	$ 659	825
Level 3 [Member] \| Consumer and other [Member] \| Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net		$ 115