FINANCING ARRANGEMENTS - Summary of Consolidated Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 01, 2018	Dec. 31, 2017	Mar. 21, 2017	Sep. 28, 2010
Long-term debt, net of unamortized debt discount
Principal Amount	$ 25,055		$ 25,752
Total long-term debt and other	24,731		25,444
Less: Current portion of long-term debt and other	298		209
Non-current portion of long-term debt	24,433		25,235
Series F Tranche B Term Loan Facility Due April 2022
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		3,521
Stated interest rate on debt (as a percent)	5.10%
Total long-term debt and other	$ 0		3,420
2025 Term Loan B Facility Due June 2025
Long-term debt, net of unamortized debt discount
Principal Amount	4,451		0
Total long-term debt and other	4,320		0
6.50% Senior Secured Notes due March in 2022
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)				6.50%
7.00% Senior Secured Notes due in March 2024
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)				7.00%
7.00% Senior Notes due in October 2020
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)					7.00%
Senior Secured Notes | 6.50% Senior Secured Notes due March in 2022
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,250		1,250
Stated interest rate on debt (as a percent)	6.50%
Total long-term debt and other	$ 1,238		1,235
Senior Secured Notes | 7.00% Senior Secured Notes due in March 2024
Long-term debt, net of unamortized debt discount
Principal Amount	$ 2,000		2,000
Stated interest rate on debt (as a percent)	7.00%
Total long-term debt and other	$ 1,978		1,975
Senior Secured Notes | 5.50% Senior Secured Notes due in November 2025
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,750		1,750
Stated interest rate on debt (as a percent)	5.50%
Total long-term debt and other	$ 1,730		1,729
Senior Unsecured Notes | 5.375% Senior Notes due March 2020
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		1,708
Stated interest rate on debt (as a percent)	5.375%	5.375%
Total long-term debt and other	$ 0		1,699
Senior Unsecured Notes | 7.00% Senior Notes due in October 2020
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		71
Stated interest rate on debt (as a percent)	7.00%
Total long-term debt and other	$ 0		71
Senior Unsecured Notes | 6.375% Senior Notes due in October 2020
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		661
Stated interest rate on debt (as a percent)	6.375%	6.375%
Total long-term debt and other	$ 0		656
Senior Unsecured Notes | 7.50% Senior Notes due in July 2021
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,625		1,625
Stated interest rate on debt (as a percent)	7.50%
Total long-term debt and other	$ 1,617		1,615
Senior Unsecured Notes | 6.75% Senior Notes due in August 2021
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		650
Stated interest rate on debt (as a percent)	6.75%	6.75%
Total long-term debt and other	$ 0		648
Senior Unsecured Notes | 5.625% Senior Notes due in December 2021
Long-term debt, net of unamortized debt discount
Principal Amount	$ 900		900
Stated interest rate on debt (as a percent)	5.625%
Total long-term debt and other	$ 896		896
Senior Unsecured Notes | 7.25% Senior Notes due in July 2022
Long-term debt, net of unamortized debt discount
Principal Amount	$ 0		550
Stated interest rate on debt (as a percent)	7.25%	7.25%
Total long-term debt and other	$ 0		545
Senior Unsecured Notes | 5.50% Senior Notes due March 2023
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,000		1,000
Stated interest rate on debt (as a percent)	5.50%
Total long-term debt and other	$ 994		993
Senior Unsecured Notes | 5.875% Senior Notes due May 2023
Long-term debt, net of unamortized debt discount
Principal Amount	$ 3,250		3,250
Stated interest rate on debt (as a percent)	5.875%
Total long-term debt and other	$ 3,228		3,224
Senior Unsecured Notes | 4.50% Senior Notes due May 2023
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,740		1,801
Stated interest rate on debt (as a percent)	4.50%
Total long-term debt and other	$ 1,729		1,787
Senior Unsecured Notes | 6.125% Senior Notes due April 2025
Long-term debt, net of unamortized debt discount
Principal Amount	$ 3,250		3,250
Stated interest rate on debt (as a percent)	6.125%
Total long-term debt and other	$ 3,225		3,222
Senior Unsecured Notes | 9.00% Senior Notes due December 2025
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,500		1,500
Stated interest rate on debt (as a percent)	9.00%
Total long-term debt and other	$ 1,468		1,464
Senior Unsecured Notes | 9.25% Senior Notes due April 2026
Long-term debt, net of unamortized debt discount
Principal Amount	$ 1,500		0
Stated interest rate on debt (as a percent)	9.25%
Total long-term debt and other	$ 1,481		0
Senior Unsecured Notes | 8.50% Senior Notes Due January 2027
Long-term debt, net of unamortized debt discount
Principal Amount	$ 750		0
Stated interest rate on debt (as a percent)	8.50%	8.50%
Total long-term debt and other	$ 738		0
Senior Unsecured Notes | Other
Long-term debt, net of unamortized debt discount
Principal Amount	14		15
Total long-term debt and other	14		15
Revolving Credit Facility | Revolving Credit Facility Due April 2018
Long-term debt, net of unamortized debt discount
Principal Amount	0		0
Total long-term debt and other	0		0
Revolving Credit Facility | Revolving Credit Facility Due April 2020
Long-term debt, net of unamortized debt discount
Principal Amount	0		250
Total long-term debt and other	0		250
Revolving Credit Facility | Revolving Credit Facility Due June 2023
Long-term debt, net of unamortized debt discount
Principal Amount	$ 75		0
Stated interest rate on debt (as a percent)	5.10%
Total long-term debt and other	$ 75		$ 0