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DEBT (Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 31, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 3,893	$ 3,784
Debt issuance costs	(17)	(20)
Less: current portion of long-term debt	464	36
Total long-term debt, net of current portion	3,429	3,748
Secured Receivables Credit Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 160	$ 30
Interest rate at period end	3.39%	2.27%
2.70% Senior Notes due April 2019 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 300	$ 300
Debt instrument, interest rate	2.70%
Debt instrument, maturity date	Apr. 01, 2019
4.75% Senior Notes due January 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 507	514
Debt instrument, interest rate	4.75%
Debt instrument, maturity date	Jan. 30, 2020
2.50% Senior Notes due March 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 300	300
Debt instrument, interest rate	2.50%
Debt instrument, maturity date	Mar. 30, 2020
4.70% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 557	559
Debt instrument, interest rate	4.70%
Debt instrument, maturity date	Apr. 01, 2021
4.25% Senior Notes due April 2024 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 299	303
Debt instrument, interest rate	4.25%
Debt instrument, maturity date	Apr. 01, 2024
3.50% Senior Notes due March 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 562	566
Debt instrument, interest rate	3.50%
Debt instrument, maturity date	Mar. 30, 2025
3.45% Senior Notes due June 2026 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 469	470
Debt issuance costs			$ (4)
Debt instrument, interest rate	3.45%		3.45%
Debt instrument, maturity date	Jun. 30, 2026
6.95% Senior Notes Due 2037 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 175	174
Debt instrument, interest rate	6.95%			6.95%
Debt instrument, maturity date	Jul. 01, 2037
5.75% Senior Notes Due 2040 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 244	244
Debt instrument, interest rate	5.75%			5.75%
Debt instrument, maturity date	Jan. 30, 2040
4.70% Senior Notes due March 2045 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 300	300
Debt instrument, interest rate	4.70%
Debt instrument, maturity date	Mar. 30, 2045
Other [Member]
Debt Instrument [Line Items]
Other	$ 37	$ 44

X

- Definition

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

+ References

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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