Held-to-maturity Securities (Details - OTTI) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	$ 3,927	$ 155
Held-to-maturity securities, twelve months or longer, fair value	1,629	2,849
Held-to-maturity securities, fair value	5,556	3,004
Held-to-maturity securities, less than twelve months, aggregate losses	(37)	(1)
Held-to-maturity securities, twelve months or longer, aggregate losses	(36)	(44)
Held-to-maturity securities, aggregate losses	(73)	(45)
Agency Mortgage-Backed Securities and CMOs [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	2,807	45
Held-to-maturity securities, twelve months or longer, fair value	1,495	2,289
Held-to-maturity securities, fair value	4,302	2,334
Held-to-maturity securities, less than twelve months, aggregate losses	(25)	0
Held-to-maturity securities, twelve months or longer, aggregate losses	(33)	(39)
Held-to-maturity securities, aggregate losses	(58)	(39)
Agency Debentures [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	114
Held-to-maturity securities, twelve months or longer, fair value	0
Held-to-maturity securities, fair value	114
Held-to-maturity securities, less than twelve months, aggregate losses	(2)
Held-to-maturity securities, twelve months or longer, aggregate losses	0
Held-to-maturity securities, aggregate losses	(2)	0
Agency Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	1,006	110
Held-to-maturity securities, twelve months or longer, fair value	134	560
Held-to-maturity securities, fair value	1,140	670
Held-to-maturity securities, less than twelve months, aggregate losses	(10)	(1)
Held-to-maturity securities, twelve months or longer, aggregate losses	(3)	(5)
Held-to-maturity securities, aggregate losses	$ (13)	$ (6)

Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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