Fair Value Disclosures (Details - FV of Financial Instruments) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 2,233	$ 1,783	$ 1,838	$ 2,762
Cash required to be segregated under federal or other regulations	1,057	555
Total held-to-maturity securities	13,013	12,248
Receivables from brokers, dealers and clearing organizations	520	884
Margin Receivables	7,398	7,675
Total loans receivable, net	4,613	5,979
Deposits	29,445	24,890
Payables to brokers, dealers and clearing organizations	1,576	1,699
Customer Payables	6,544	6,455
Securities sold under agreements to repurchase	82	3,672
Other borrowings	491	4,971
Corporate debt	997	1,366
Allowance for loan losses	353	404	453	481
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	2,233	1,783
Cash required to be segregated under federal or other regulations	1,057	555
Total held-to-maturity securities	13,013	12,248
Receivables from brokers, dealers and clearing organizations	520	884
Margin Receivables	7,398	7,675
Total loans receivable, net	4,613	5,979
Deposits	29,445	24,890
Payables to brokers, dealers and clearing organizations	1,576	1,699
Customer Payables	6,544	6,455
Securities sold under agreements to repurchase	82	3,672
FHLB advances and trust preferred securities	409	1,299
Other borrowings	491	4,971
Corporate debt	997	1,366
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	2,233	1,783
Cash required to be segregated under federal or other regulations	1,057	555
Total held-to-maturity securities	13,123	12,476
Receivables from brokers, dealers and clearing organizations	520	884
Margin Receivables	7,398	7,675
Total loans receivable, net	4,412	5,465
Deposits	29,444	24,890
Payables to brokers, dealers and clearing organizations	1,576	1,699
Customer Payables	6,544	6,455
Securities sold under agreements to repurchase	82	3,681
FHLB advances and trust preferred securities	252	1,174
Other borrowings	334	4,855
Corporate debt	1,055	1,491
One- To Four-Family [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	40	27	102	184
One- To Four-Family [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	2,465	3,053
One- To Four-Family [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	2,409	2,742
Home Equity [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	307	367	326	257
Home Equity [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,810	2,475
Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,660	2,274
Consumer And Other [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	6	10	$ 25	$ 40
Consumer And Other [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	338	451
Consumer And Other [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	343	449
Agency Mortgage-Backed Securities and CMOs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10,353	9,793
Agency Mortgage-Backed Securities and CMOs [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10,353	9,793
Agency Mortgage-Backed Securities and CMOs [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10,444	9,971
Agency Debentures [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	127	164
Agency Debentures [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	127	164
Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	125	166
Agency Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,523	2,281
Agency Debt Securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,523	2,281
Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,544	2,329
Other Non-Agency Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10	10
Other Non-Agency Debt Securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10	10
Other Non-Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10	10
Unfunded Commitments to Extend Credit [Member]
Supply Commitment [Line Items]
Supply Commitment, Remaining Minimum Amount Committed	70
Level 1 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	2,233	1,783
Cash required to be segregated under federal or other regulations	1,057	555
Level 2 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	13,113	12,466
Receivables from brokers, dealers and clearing organizations	520	884
Margin Receivables	7,398	7,675
Deposits	29,444	24,890
Payables to brokers, dealers and clearing organizations	1,576	1,699
Customer Payables	6,544	6,455
Securities sold under agreements to repurchase	82	3,681
FHLB advances and trust preferred securities	0	922
Other borrowings	82	4,603
Corporate debt	1,055	1,491
Level 2 [Member] | Agency Mortgage-Backed Securities and CMOs [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10,444	9,971
Level 2 [Member] | Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	125	166
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	2,544	2,329
Level 3 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	10	10
Total loans receivable, net	4,412	5,465
FHLB advances and trust preferred securities	252	252
Other borrowings	252	252
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	2,409	2,742
Level 3 [Member] | Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,660	2,274
Level 3 [Member] | Consumer And Other [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	343	449
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	$ 10	$ 10