Fair Value Disclosures (Details - FV of Financial Instruments) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 1,091		$ 1,950	$ 2,393		$ 2,233
Cash required to be segregated under federal or other regulations	889		1,460
Total held-to-maturity securities	21,502		15,751
Margin Receivables	7,773		6,731
Total loans receivable, net	3,055		3,551
Receivables from brokers, dealers and clearing organizations	1,237		1,056
Deposits	40,072		31,682
Customer Payables	7,992		8,159
Payables to brokers, dealers and clearing organizations	1,473		983
Securities sold under agreements to repurchase	400		0
FHLB advances	200		0
Trust preferred securities	409		409
Other borrowings	1,009		409
Allowance for loan losses	116	$ 213	221	293	$ 322	353
Corporate debt	992		994
Margin Receivables Detail [Abstract]
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	11,000		9,800
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged	2,900		2,000
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	1,091		1,950
Cash required to be segregated under federal or other regulations	889		1,460
Total held-to-maturity securities	21,502		15,751
Margin Receivables	7,773		6,731
Total loans receivable, net	3,055		3,551
Receivables from brokers, dealers and clearing organizations	1,103		1,056
Deposits	40,072		31,682
Customer Payables	7,992		8,159
Payables to brokers, dealers and clearing organizations	1,473		983
Securities sold under agreements to repurchase	400
FHLB advances	200
Trust preferred securities	409		409
Other borrowings	1,009
Corporate debt	992		994
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	1,091		1,950
Cash required to be segregated under federal or other regulations	889		1,460
Total held-to-maturity securities	21,565		15,716
Margin Receivables	7,773		6,731
Total loans receivable, net	3,060		3,502
Receivables from brokers, dealers and clearing organizations	1,103		1,056
Deposits	40,072		31,681
Customer Payables	7,992		8,159
Payables to brokers, dealers and clearing organizations	1,473		983
Securities sold under agreements to repurchase	400
FHLB advances	200
Trust preferred securities	321		288
Other borrowings	921
Corporate debt	1,040		1,050
One- To Four-Family [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	29	46	45	42	49	40
One- To Four-Family [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,642		1,918
One- To Four-Family [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,676		1,942
Home Equity [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	82	162	171	245	267	307
Home Equity [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,204		1,385
Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,175		1,311
Consumer [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	5	$ 5	5	$ 6	$ 6	$ 6
Consumer [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	209		248
Consumer [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	209		249
Agency mortgage-backed securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	18,426		12,868
Agency mortgage-backed securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	18,426		12,868
Agency mortgage-backed securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	18,479		12,839
Agency Debentures [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	291		29
Agency Debentures [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	291		29
Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	291		29
Agency Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,778		2,854
Agency Debt Securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,778		2,854
Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,788		2,848
Other Non-Agency Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	7
Other Non-Agency Debt Securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	7
Other Non-Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	$ 7
Unfunded Commitments to Extend Credit [Member]
Supply Commitment [Line Items]
HELOCs closed, Number of Years	10 years
Level 1 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 1,091		1,950
Cash required to be segregated under federal or other regulations	889		1,460
Level 2 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	21,558		15,716
Margin Receivables	7,773		6,731
Receivables from brokers, dealers and clearing organizations	1,103		1,056
Deposits	40,072		31,681
Customer Payables	7,992		8,159
Payables to brokers, dealers and clearing organizations	1,473		983
Securities sold under agreements to repurchase	400
FHLB advances	200
Other borrowings	600
Corporate debt	1,040		1,050
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	18,479		12,839
Level 2 [Member] | Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	291		29
Level 2 [Member] | Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,788		2,848
Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	7		0
Total loans receivable, net	3,060		3,502
Trust preferred securities	321		288
Other borrowings	321
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	1,676		1,942
Level 3 [Member] | Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,175		1,311
Level 3 [Member] | Consumer [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	209		$ 249
Level 3 [Member] | Other Non-Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	$ 7