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CAPITALIZATION - Long-term Debt and Other Long-term Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Capitalization [Line Items]
Finance lease obligations	$ 45	$ 60
Unamortized debt discounts	(34)	(33)
Unamortized debt issuance costs	(118)	(103)
Unamortized fair value adjustments	7	8
Currently payable long-term debt	(146)	(380)
Total long-term debt and other long-term obligations	22,131	19,618
FMBs and secured notes - fixed rate
Schedule of Capitalization [Line Items]
FMBs and secured notes - fixed rate	$ 4,802	4,741
FMBs and secured notes - fixed rate | Minimum
Schedule of Capitalization [Line Items]
Interest rate (percent)	2.67%
FMBs and secured notes - fixed rate | Maximum
Schedule of Capitalization [Line Items]
Interest rate (percent)	8.25%
Unsecured notes - fixed rate
Schedule of Capitalization [Line Items]
Unsecured debt	$ 17,575	14,575
Unsecured notes - fixed rate | Minimum
Schedule of Capitalization [Line Items]
Interest rate (percent)	1.60%
Unsecured notes - fixed rate | Maximum
Schedule of Capitalization [Line Items]
Interest rate (percent)	7.375%
Unsecured notes - variable rate
Schedule of Capitalization [Line Items]
Unsecured debt	$ 0	$ 750

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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

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