DEBT (Narrative) (Details) - USD ($)	1 Months Ended	6 Months Ended	9 Months Ended
	Apr. 27, 2017	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Oct. 02, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Net borrowings under facilities			$ (1,065,000,000)	$ 550,000,000
Long-term debt			6,291,100,000			$ 7,065,900,000
Proceeds from equity method investment, distribution	$ 1,140,000,000		28,100,000	$ 0
Fixed Rate Debt Obligations [Member]
Line of Credit Facility [Line Items]
Debt instrument, fair value disclosure			6,200,000,000			6,500,000,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Remaining borrowing capacity			1,485,200,000
Net borrowings under facilities			1,000,000,000
Proceeds from lines of credit			8,800,000,000
Repayments of lines of credit			9,800,000,000
364-Day Credit Facility [Member]
Line of Credit Facility [Line Items]
Net borrowings under facilities			700,000,000
Proceeds from lines of credit	$ 400,000,000		8,900,000,000
Repayments of lines of credit			8,200,000,000
EUS 364-day Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity of line of credit		$ 625,000,000
Net borrowings under facilities			200,000,000
Proceeds from lines of credit			600,000,000
Repayments of lines of credit			800,000,000
Long-term debt			1,500,000,000
Line of credit facility, expiration date		Jun. 29, 2018
Commercial Paper And Revolvong Credit facility [Member]
Line of Credit Facility [Line Items]
Long-term debt			1,280,500,000			1,657,600,000
Uncommitted Demand Credit Facilities [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity of line of credit			175,000,000
Remaining borrowing capacity			$ 86,300,000			$ 70,900,000
Subsequent Event [Member] | Unsecured Debt [Member] | Credit Facility Expires September 26, 2020 [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity of line of credit					$ 185,000,000
Subsequent Event [Member] | Unsecured Debt [Member] | Credit Facility Expiring September 26, 2018 [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity of line of credit					$ 175,000,000