Available-for-Sale Securities (Details - OTTI) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	$ 7,391	$ 406
Available-for-sale securities, twelve months or longer, fair value	2,524	4,704
Available-for-sale securities, fair value	9,915	5,110
Available-for-sale securities, less than twelve months, aggregate losses	(105)	(1)
Available-for-sale securities, twelve months or longer, aggregate losses	(79)	(106)
Available-for-sale securities, aggregate losses	(184)	(107)
Agency Mortgage-Backed Securities and CMOs [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	6,832	403
Available-for-sale securities, twelve months or longer, fair value	2,496	4,674
Available-for-sale securities, fair value	9,328	5,077
Available-for-sale securities, less than twelve months, aggregate losses	(88)	(1)
Available-for-sale securities, twelve months or longer, aggregate losses	(78)	(104)
Available-for-sale securities, aggregate losses	(166)	(105)
Agency Debentures [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	329	0
Available-for-sale securities, twelve months or longer, fair value	9	9
Available-for-sale securities, fair value	338	9
Available-for-sale securities, less than twelve months, aggregate losses	(12)	0
Available-for-sale securities, twelve months or longer, aggregate losses	0	0
Available-for-sale securities, aggregate losses	(12)	0
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	143
Available-for-sale securities, twelve months or longer, fair value	0
Available-for-sale securities, fair value	143
Available-for-sale securities, less than twelve months, aggregate losses	(4)
Available-for-sale securities, twelve months or longer, aggregate losses	0
Available-for-sale securities, aggregate losses	(4)
Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	55
Available-for-sale securities, twelve months or longer, fair value	0
Available-for-sale securities, fair value	55
Available-for-sale securities, less than twelve months, aggregate losses	0
Available-for-sale securities, twelve months or longer, aggregate losses	0
Available-for-sale securities, aggregate losses	0
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	0	3
Available-for-sale securities, twelve months or longer, fair value	15	16
Available-for-sale securities, fair value	15	19
Available-for-sale securities, less than twelve months, aggregate losses	0	0
Available-for-sale securities, twelve months or longer, aggregate losses	0	(1)
Available-for-sale securities, aggregate losses	0	(1)
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, twelve months or longer, fair value	4	5
Available-for-sale securities, fair value	4	5
Available-for-sale securities, twelve months or longer, aggregate losses	(1)	(1)
Available-for-sale securities, aggregate losses	(1)	$ (1)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	32
Available-for-sale securities, twelve months or longer, fair value	0
Available-for-sale securities, fair value	32
Available-for-sale securities, less than twelve months, aggregate losses	(1)
Available-for-sale securities, twelve months or longer, aggregate losses	0
Available-for-sale securities, aggregate losses	$ (1)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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)(2)
-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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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ 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
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Reference 1: 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=27724398&loc=d3e27337-111563

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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