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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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FINANCING ARRANGEMENTS - Senior Secured Credit Facilities (Details)									1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 01, 2018 USD ($)	Apr. 20, 2018 USD ($)	Nov. 21, 2017 USD ($)	Nov. 10, 2017 USD ($)	Oct. 05, 2017 USD ($)	Jul. 03, 2017 USD ($)	Mar. 28, 2017 USD ($)	Mar. 21, 2017 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Apr. 19, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 20, 2017	Jan. 01, 2017 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt										$ 0	$ 1,000,000	$ 75,000,000	$ 65,000,000
Debt issuance costs	$ 74,000,000
Debt modification costs	4,000,000
Repayments of long-term debt												8,200,000,000	9,249,000,000
Net proceeds from the issuance of debt												7,471,000,000	$ 6,231,000,000
Long-term debt										$ 24,731,000,000		$ 24,731,000,000			$ 25,444,000,000
Series F Tranche B Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 3,060,000,000
Quarterly amortization rate (as a percent)								1.25%								0.25%
Annual amortization rate (as a percent)								5.00%								1.00%
Stated interest rate on debt (as a percent)										5.10%		5.10%
Repayments of Revolving Credit Facility			$ 750,000,000
Loss on extinguishment of debt	48,000,000							$ 27,000,000
Debt issuance costs								38,000,000
Debt modification costs								3,000,000
Repayments of long-term debt	3,315,000,000		$ 750,000,000	$ 181,000,000	$ 923,000,000	$ 811,000,000			$ 220,000,000
Long-term debt										$ 0		$ 0			3,420,000,000
Revolving Credit Facility Due June 2023 \| Eurocurrency rate \| Minimum
Debt Instrument [Line Items]
Variable rate (as a percentage)												0.00%
Revolving Credit Facility Due June 2023 \| Canada Bankers Acceptance Rate
Debt Instrument [Line Items]
Variable rate (as a percentage)												1.00%
Revolving Credit Facility Due June 2023 \| Canada Bankers Acceptance Rate \| Minimum
Debt Instrument [Line Items]
Variable rate (as a percentage)												0.00%
2025 Term Loan B Facility
Debt Instrument [Line Items]
Annual amortization rate (as a percent)										5.00%		5.00%
Principal amount	$ 4,565,000,000
Debt term	7 years
Long-term debt										$ 4,320,000,000		$ 4,320,000,000			0
2025 Term Loan B Facility \| Base Rate
Debt Instrument [Line Items]
Variable rate (as a percentage)												2.00%
2025 Term Loan B Facility \| Eurocurrency rate
Debt Instrument [Line Items]
Variable rate (as a percentage)												3.00%
Senior Secured Credit Facilities
Debt Instrument [Line Items]
Debt covenant, mandatory prepayments, percentage net cash proceeds, property and asset losses												100.00%
Debt covenant, mandatory prepayments, percentage net cash proceeds, incurrence of debt												100.00%
Debt covenant, mandatory prepayments, percentage of consolidated excess cash flow												50.00%
Debt covenant, mandatory prepayments, percentage net cash proceeds, asset sales												100.00%
Senior Secured Credit Facilities \| Federal Funds
Debt Instrument [Line Items]
Variable rate (as a percentage)												0.50%
Senior Secured Credit Facilities \| Eurocurrency rate
Debt Instrument [Line Items]
Variable rate (as a percentage)												1.00%
Senior Secured Credit Facilities \| Eurocurrency rate \| Minimum
Debt Instrument [Line Items]
Variable rate (as a percentage)												1.00%
Senior Unsecured Notes \| 6.75% Senior Unsecured Notes due August 2018
Debt Instrument [Line Items]
Principal amount								$ 1,100,000,000
Stated interest rate on debt (as a percent)								6.75%
Senior Unsecured Notes \| 5.375% Senior Notes due March 2020
Debt Instrument [Line Items]
Stated interest rate on debt (as a percent)	5.375%									5.375%		5.375%
Repayments of long-term debt	$ 691,000,000
Long-term debt										$ 0		$ 0			1,699,000,000
Senior Unsecured Notes \| 6.75% Senior Notes due in August 2021
Debt Instrument [Line Items]
Stated interest rate on debt (as a percent)	6.75%									6.75%		6.75%
Repayments of long-term debt	$ 578,000,000
Long-term debt										$ 0		$ 0			648,000,000
Senior Unsecured Notes \| 7.25% Senior Notes due in July 2022
Debt Instrument [Line Items]
Stated interest rate on debt (as a percent)	7.25%									7.25%		7.25%
Repayments of long-term debt	$ 550,000,000
Long-term debt										$ 0		$ 0			545,000,000
Senior Unsecured Notes \| 6.375% Senior Notes due in October 2020
Debt Instrument [Line Items]
Stated interest rate on debt (as a percent)	6.375%									6.375%		6.375%
Repayments of long-term debt	$ 146,000,000
Long-term debt										$ 0		$ 0			656,000,000
Senior Unsecured Notes \| 8.50% Senior Notes Due January 2027
Debt Instrument [Line Items]
Stated interest rate on debt (as a percent)	8.50%									8.50%		8.50%
Net proceeds from the issuance of debt	$ 750,000,000
Long-term debt										$ 738,000,000		$ 738,000,000			0
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 1,190,000,000										$ 1,500,000,000
Repayments of Revolving Credit Facility		$ 250,000,000						$ 350,000,000
Loss on extinguishment of debt							$ 1,000,000
Maturity date extension period							91 days
Other indebtedness for borrowed money threshold							$ 750,000,000
Additional borrowing capacity														$ 60,000,000
Quarterly amortization payments												$ 1,427,000,000
Secured leverage ratio										4.00		4.00
Threshold for incremental borrowings										$ 1,000,000,000		$ 1,000,000,000
Interest coverage ratio										2.00		2.00
Revolving Credit Facility \| Revolving Credit Facility Due April 2020
Debt Instrument [Line Items]
Long-term debt										$ 0		$ 0			250,000,000
Revolving Credit Facility \| Revolving Credit Facility Due April 2020 \| Base Rate
Debt Instrument [Line Items]
Variable rate (as a percentage)			2.50%
Revolving Credit Facility \| Revolving Credit Facility Due April 2020 \| LIBOR
Debt Instrument [Line Items]
Variable rate (as a percentage)			3.50%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1,225,000,000
Stated interest rate on debt (as a percent)										5.10%		5.10%
Alternate debt term, number of days prior to scheduled maturity of principal amount in excess of threshold												91 days
Alternate debt term, principal amount in excess of threshold										$ 1,000,000,000		$ 1,000,000,000
Long-term debt										75,000,000		75,000,000			$ 0
Remaining borrowings										$ 980,000,000		$ 980,000,000
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Minimum
Debt Instrument [Line Items]
Commitment fee (as a percent)												0.25%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Maximum
Debt Instrument [Line Items]
Commitment fee (as a percent)												0.50%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Variable rate (as a percentage)												1.50%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Variable rate (as a percentage)												2.00%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Eurocurrency rate \| Minimum
Debt Instrument [Line Items]
Variable rate (as a percentage)												2.50%
Revolving Credit Facility \| Revolving Credit Facility Due June 2023 \| Eurocurrency rate \| Maximum
Debt Instrument [Line Items]
Variable rate (as a percentage)												3.00%
Revolving Credit Facility \| Senior Secured Notes
Debt Instrument [Line Items]
Secured leverage ratio										3.50		3.50
Revolving Credit Facility \| Senior Unsecured Notes
Debt Instrument [Line Items]
Secured leverage ratio										6.50		6.50
Letter of Credit \| Revolving Credit Facility Due April 2020
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 300,000,000
Letter of Credit \| Revolving Credit Facility Due June 2023
Debt Instrument [Line Items]
Long-term debt										$ 170,000,000		$ 170,000,000