SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disclosure Text Block Supplement [Abstract]
Temporary investments	$ 425		$ 425		$ 358
Allowance for doubtful accounts	69		69		76
Accumulated depreciation	21,000		21,000		21,400
Depreciation expense	292	$ 293	586	$ 602
Accounts Payable, Other	38		38		41
Insurance Recoveries			4	30
Interest payments			248	$ 338
Asset retirement obligation	$ 127		$ 127		$ 116

Amount of obligations incurred and payable classified as other.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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