DERIVATIVES AND HEDGE ACCOUNTING (Details - Fair values of derivative assets and liabilities) - USD ($) $ in Billions	Dec. 31, 2017	Dec. 31, 2016
Collateral
Collateral posted to third parties for derivative transactions	$ 2.9	$ 4.5
Collateral obtained from third parties for derivative transactions	$ 1.3	$ 1.5

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

Name:	us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant