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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities 2017 Activity (Details) - USD ($)			12 Months Ended
	Mar. 08, 2019	Mar. 21, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 01, 2018	Mar. 28, 2017	Jan. 01, 2017
Debt Instrument [Line Items]
Repayments of long-term debt			$ 4,406,000,000	$ 10,101,000,000	$ 14,203,000,000
Loss on extinguishment of debt	$ 8,000,000		42,000,000	119,000,000	122,000,000
Revolving credit facility
Debt Instrument [Line Items]
Repayments of long-term debt				$ 571,000,000
Repayments of lines of credit		$ 350,000,000	$ 806,000,000
Maximum borrowing capacity							$ 1,190,000,000	$ 1,500,000,000
Senior Credit Facilities
Debt Instrument [Line Items]
Repayments of long-term debt, using sale proceeds					3,221,000,000
Repayments of long-term debt, using cash on hand					786,000,000
Loss on extinguishment of debt					66,000,000
2023 Revolving Credit Facility Due June 2023 | Revolving credit facility
Debt Instrument [Line Items]
Aggregate principal amount		4,962,000,000
Stated interest rate			4.74%
Maximum borrowing capacity						$ 1,225,000,000
Senior Unsecured Notes
Debt Instrument [Line Items]
Repurchased face amount		$ 1,100,000,000
Stated interest rate		6.75%
Revolving Credit Facility Due April 2020 | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 3,000,000

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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