Fair Value Disclosures (Details - FV of Financial Instruments) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	$ 1,627	$ 2,233	$ 1,025	$ 1,783
Cash required to be segregated under federal or other regulations	2,158	1,057
Total held-to-maturity securities	14,968	13,013
Margin Receivables	6,336	7,398
Total loans receivable, net	4,360	4,613
Receivables from brokers, dealers and clearing organizations	611	520
Deposits	31,829	29,445
Customer Payables	6,793	6,544
Payables to brokers, dealers and clearing organizations	1,437	1,576
Securities sold under agreements to repurchase		82
Other borrowings	409	491
Corporate debt	993	997
Allowance for loan losses	322	353	402	404
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	1,627	2,233
Cash required to be segregated under federal or other regulations	2,158	1,057
Total held-to-maturity securities	14,968	13,013
Margin Receivables	6,336	7,398
Total loans receivable, net	4,360	4,613
Receivables from brokers, dealers and clearing organizations	611	520
Deposits	31,829	29,445
Customer Payables	6,793	6,544
Payables to brokers, dealers and clearing organizations	1,437	1,576
Securities sold under agreements to repurchase		82
Trust preferred securities	409	409
Other borrowings		491
Corporate debt	993	997
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	1,627	2,233
Cash required to be segregated under federal or other regulations	2,158	1,057
Total held-to-maturity securities	15,371	13,123
Margin Receivables	6,336	7,398
Total loans receivable, net	4,187	4,412
Receivables from brokers, dealers and clearing organizations	611	520
Deposits	31,829	29,444
Customer Payables	6,793	6,544
Payables to brokers, dealers and clearing organizations	1,437	1,576
Securities sold under agreements to repurchase		82
Trust preferred securities	250	252
Other borrowings		334
Corporate debt	1,039	1,055
One- To Four-Family [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	49	40	31	27
One- To Four-Family [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	2,337	2,465
One- To Four-Family [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	2,282	2,409
Home Equity [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	267	307	360	367
Home Equity [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,709	1,810
Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,583	1,660
Consumer And Other [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Allowance for loan losses	6	6	$ 11	$ 10
Consumer And Other [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	314	338
Consumer And Other [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	322	343
Agency Mortgage-Backed Securities and CMOs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	12,016	10,353
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	12,016	10,353
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	12,327	10,444
Agency Debentures [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	127	127
Agency Debentures [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	127	127
Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	128	125
Agency Debt Securities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,815	2,523
Agency Debt Securities [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,815	2,523
Agency Debt Securities [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	2,906	2,544
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	55
Level 1 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and equivalents	1,627	2,233
Cash required to be segregated under federal or other regulations	2,158	1,057
Level 2 [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	15,361	13,113
Margin Receivables	6,336	7,398
Receivables from brokers, dealers and clearing organizations	611	520
Deposits	31,829	29,444
Customer Payables	6,793	6,544
Payables to brokers, dealers and clearing organizations	1,437	1,576
Securities sold under agreements to repurchase		82
Other borrowings		82
Corporate debt	1,039	1,055
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	12,327	10,444
Level 2 [Member] | Agency Debentures [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total held-to-maturity securities	128	125
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	2,906	2,544
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	4,187	4,412
Trust preferred securities	250	252
Other borrowings		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	2,282	2,409
Level 3 [Member] | Home Equity [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	1,583	1,660
Level 3 [Member] | Consumer And Other [Member] | Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total loans receivable, net	322	343
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