Derivative Instruments and Hedging Activities (Details - Fair Value Hedge) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge, Hedging Instrument	$ (116)	$ (40)
Fair Value Hedge, Hedged Item	114	39
Fair Value Hedge, Hedge Ineffectiveness	(2)	(1)
Agency Debentures [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge, Hedging Instrument	(47)	(21)
Fair Value Hedge, Hedged Item	46	20
Fair Value Hedge, Hedge Ineffectiveness	(1)	(1)
Agency mortgage-backed securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair Value Hedge, Hedging Instrument	(69)	(19)
Fair Value Hedge, Hedged Item	68	19
Fair Value Hedge, Hedge Ineffectiveness	$ (1)	$ 0

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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