Available-for-Sale Securities (Details - OTTI) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	$ 3,603	$ 7,391
Available-for-sale securities, twelve months or longer, fair value	2,540	2,524
Available-for-sale securities, fair value	6,143	9,915
Available-for-sale securities, less than twelve months, aggregate losses	(29)	(105)
Available-for-sale securities, twelve months or longer, aggregate losses	(40)	(79)
Available-for-sale securities, aggregate losses	(69)	(184)
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	3,315	6,832
Available-for-sale securities, twelve months or longer, fair value	2,521	2,496
Available-for-sale securities, fair value	5,836	9,328
Available-for-sale securities, less than twelve months, aggregate losses	(24)	(88)
Available-for-sale securities, twelve months or longer, aggregate losses	(39)	(78)
Available-for-sale securities, aggregate losses	(63)	(166)
Agency Debentures [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	149	329
Available-for-sale securities, twelve months or longer, fair value	15	9
Available-for-sale securities, fair value	164	338
Available-for-sale securities, less than twelve months, aggregate losses	(1)	(12)
Available-for-sale securities, twelve months or longer, aggregate losses	0	0
Available-for-sale securities, aggregate losses	(1)	(12)
U.S. Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, less than twelve months, fair value	139	143
Available-for-sale securities, twelve months or longer, fair value	0
Available-for-sale securities, fair value	139	143
Available-for-sale securities, less than twelve months, aggregate losses	(4)	(4)
Available-for-sale securities, twelve months or longer, aggregate losses	0
Available-for-sale securities, aggregate losses	(4)	(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
Available-for-sale securities, twelve months or longer, fair value		15
Available-for-sale securities, fair value		15
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
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, twelve months or longer, fair value	4	4
Available-for-sale securities, fair value	4	4
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, fair value		32
Available-for-sale securities, less than twelve months, aggregate losses		(1)
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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-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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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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