FINANCING ARRANGEMENTS - Summary of Consolidated Long-term Debt (Details) - USD ($)	Sep. 30, 2020	May 26, 2020	Dec. 31, 2019	Dec. 30, 2019	May 23, 2019	Mar. 08, 2019
Long-term debt, net of unamortized debt discount
Principal Amount	$ 24,601,000,000		$ 26,188,000,000
Total long-term debt and other	24,343,000,000		25,895,000,000
Less: Current portion of long-term debt and other	0		1,234,000,000
Non-current portion of long-term debt	$ 24,343,000,000		24,661,000,000
Term Loan B Facility Due June 2025
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	3.15%
Principal Amount	$ 3,498,000,000		3,869,000,000
Total long-term debt and other	$ 3,414,000,000		3,768,000,000
Term Loan B Facility Due November 2025
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	2.90%
Principal Amount	$ 1,200,000,000		1,275,000,000
Total long-term debt and other	$ 1,185,000,000		1,257,000,000
Senior Secured Notes | 6.50% Senior Notes Due March 2022
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	6.50%	6.50%
Principal Amount	$ 0		1,250,000,000
Total long-term debt and other	$ 0		1,242,000,000
Senior Secured Notes | 7.00% Senior Notes Due March 2024
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	7.00%
Principal Amount	$ 2,000,000,000		2,000,000,000
Total long-term debt and other	$ 1,986,000,000		1,983,000,000
Senior Secured Notes | 5.50% Senior Notes Due November 2025
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.50%
Principal Amount	$ 1,750,000,000		1,750,000,000
Total long-term debt and other	$ 1,735,000,000		1,733,000,000
Senior Secured Notes | 5.75% Senior Notes Due August 2027
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.75%
Principal Amount	$ 500,000,000		500,000,000
Total long-term debt and other	$ 494,000,000		493,000,000
Senior Unsecured Notes | 5.50% Senior Notes Due March 2023
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.50%					5.50%
Principal Amount	$ 284,000,000		402,000,000
Total long-term debt and other	$ 283,000,000		400,000,000
Senior Unsecured Notes | 5.875% Senior Notes Due May 2023
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.875%					5.875%
Principal Amount	$ 99,000,000		1,448,000,000
Total long-term debt and other	$ 99,000,000		1,441,000,000
Senior Unsecured Notes | 4.50% Senior Notes euro-denoted debt Due May 2023
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	4.50%
Principal Amount	$ 1,758,000,000		1,682,000,000
Total long-term debt and other	$ 1,752,000,000		1,674,000,000
Senior Unsecured Notes | 6.125% Senior Notes Due April 2025
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	6.125%
Principal Amount	$ 3,250,000,000		3,250,000,000
Total long-term debt and other	$ 3,233,000,000		3,230,000,000
Senior Unsecured Notes | 9.00% Senior Notes Due December 2025
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	9.00%
Principal Amount	$ 1,500,000,000		1,500,000,000
Total long-term debt and other	$ 1,477,000,000		1,473,000,000
Senior Unsecured Notes | 9.25% Senior Notes Due April 2026
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	9.25%
Principal Amount	$ 1,500,000,000		1,500,000,000
Total long-term debt and other	$ 1,486,000,000		1,484,000,000
Senior Unsecured Notes | 8.50% Senior Notes Due January 2027
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	8.50%					8.50%
Principal Amount	$ 1,750,000,000		1,750,000,000
Total long-term debt and other	$ 1,755,000,000		1,756,000,000
Senior Unsecured Notes | 7.00 % Senior Notes Due January 2028
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	7.00%				7.00%
Principal Amount	$ 750,000,000		750,000,000
Total long-term debt and other	$ 741,000,000		741,000,000
Senior Unsecured Notes | 5.00% Senior Notes Due January 2028
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.00%			5.00%
Principal Amount	$ 1,250,000,000		1,250,000,000
Total long-term debt and other	$ 1,235,000,000		1,234,000,000
Senior Unsecured Notes | 6.25% Senior Notes Due February 2029
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	6.25%	6.25%
Principal Amount	$ 1,500,000,000		0
Total long-term debt and other	$ 1,480,000,000		0
Senior Unsecured Notes | 7.25 % Senior Notes Due May 2029
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	7.25%				7.25%
Principal Amount	$ 750,000,000		750,000,000
Total long-term debt and other	$ 741,000,000		740,000,000
Senior Unsecured Notes | 5.25% Senior Notes Due January 2030
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	5.25%			5.25%
Principal Amount	$ 1,250,000,000		1,250,000,000
Total long-term debt and other	1,235,000,000		1,234,000,000
Senior Unsecured Notes | Other
Long-term debt, net of unamortized debt discount
Principal Amount	12,000,000		12,000,000
Total long-term debt and other	$ 12,000,000		12,000,000
Revolving Credit Facility | Revolving Credit Facility Due June 2023
Long-term debt, net of unamortized debt discount
Stated interest rate on debt (as a percent)	3.15%
Principal Amount	$ 0		0
Total long-term debt and other	$ 0		$ 0