Held-to-maturity Securities (Details - OTTI) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	$ 8,554	$ 7,686
Held-to-maturity securities, twelve months or longer, fair value	1,165	1,290
Held-to-maturity securities, fair value	9,719	8,976
Held-to-maturity securities, less than twelve months, aggregate losses	(109)	(155)
Held-to-maturity securities, twelve months or longer, aggregate losses	(27)	(29)
Held-to-maturity securities, aggregate losses	(136)	(184)
Agency Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	6,910	5,929
Held-to-maturity securities, twelve months or longer, fair value	1,148	1,272
Held-to-maturity securities, fair value	8,058	7,201
Held-to-maturity securities, less than twelve months, aggregate losses	(88)	(123)
Held-to-maturity securities, twelve months or longer, aggregate losses	(27)	(29)
Held-to-maturity securities, aggregate losses	(115)	(152)
Agency Debentures [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	161	18
Held-to-maturity securities, twelve months or longer, fair value	0
Held-to-maturity securities, fair value	161	18
Held-to-maturity securities, less than twelve months, aggregate losses	(1)	0
Held-to-maturity securities, twelve months or longer, aggregate losses	0
Held-to-maturity securities, aggregate losses	(1)	0
Agency Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities, less than twelve months, fair value	1,483	1,739
Held-to-maturity securities, twelve months or longer, fair value	17	18
Held-to-maturity securities, fair value	1,500	1,757
Held-to-maturity securities, less than twelve months, aggregate losses	(20)	(32)
Held-to-maturity securities, twelve months or longer, aggregate losses	0	0
Held-to-maturity securities, aggregate losses	$ (20)	$ (32)

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=82897076&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=82897076&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=82897076&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=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&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=82897076&loc=d3e27337-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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