SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disclosure Text Block Supplement [Abstract]
Temporary investments	$ 450		$ 450		$ 335
Allowance for doubtful accounts	86		86
Accumulated depreciation	21,000		21,000		20,500
Depreciation expense	300	$ 305	902	$ 902
Interest payments			520	591
Asset retirement obligation	97		97		96
Accounts Payable, Other	$ 33		33		164
Insurance Recoveries			$ 40	$ 0
Allowance for Doubtful Accounts, Premiums and Other Receivables					$ 73

Amount of obligations incurred and payable classified as other.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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