DEBT - 7.5% Senior Unsecured Notes due 2020 (Details) - Unsecured debt - HDS (Debt Issuer) - 7.5% February 2013 Senior Unsecured Notes due 2020 - USD ($) $ in Millions	Oct. 17, 2016	Jan. 31, 2016
DEBT
Interest rate, stated rate (as a percent)	7.50%	7.50%
Debt redeemed	$ 1,275

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant