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Amount of short-term and long-term debt and lease obligation.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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LONG-TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
LONG-TERM DEBT AND LEASE OBLIGATIONS
Finance leases, mortgage and other notes	$ 370		$ 403
Unamortized issue costs and note discounts	(156)		(176)
Total long-term debt	15,218		15,719
Less current portion	127		145
Long-term debt, net of current portion	15,091		15,574
Senior Notes \| 6.750% due 2023
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 1,872		1,872
Stated interest rate, percentage	6.75%
Senior Notes \| 7.000% due 2025
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 0		478
Stated interest rate, percentage		7.00%
Senior Notes \| 6.125% due 2028
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 2,500		2,500
Stated interest rate, percentage	6.125%
Senior Notes \| 6.875% due 2031
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 362		362
Stated interest rate, percentage	6.875%
Senior Notes \| 4.625% due 2024
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 1,870		1,870
Stated interest rate, percentage	4.625%
Senior Notes \| 4.625% due 2024
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 600		600
Stated interest rate, percentage	4.625%
Senior Notes \| 7.500% due 2025
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 700		700
Stated interest rate, percentage	7.50%
Senior Notes \| 4.875% due 2026
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 2,100		2,100
Stated interest rate, percentage	4.875%
Senior Notes \| 5.125% due 2027
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 1,500		1,500
Stated interest rate, percentage	5.125%
Senior Notes \| 4.625% due 2028
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 600		600
Stated interest rate, percentage	4.625%
Senior Notes \| 4.250% due 2029
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 1,400		0
Stated interest rate, percentage	4.25%
Senior Notes \| 5.125% due 2025
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 0		1,410
Stated interest rate, percentage	5.125%
Senior Notes \| 6.250% due 2027
LONG-TERM DEBT AND LEASE OBLIGATIONS
Carrying amount	$ 1,500		$ 1,500
Stated interest rate, percentage	6.25%