VARIABLE INTEREST ENTITIES (Schedule of Consolidated Variable Interest Entities, Carrying Amounts of Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2019
Variable Interest Entity [Line Items]
Variable Interest Entity Purchase Amount					$ 331
Payments to Noncontrolling Interests		$ 297	$ 0	$ 0
Cash and cash equivalents at end of year	$ 2,367	2,367	2,724	6,189
Other current assets	16,815	16,815	39,370
Net property	20,996	20,996	21,418	$ 21,584
Other noncurrent assets	818	818	735
Total Assets	60,524	60,524	83,699
Current liabilities (less than $1 million at 12/31/2017)	10,679	10,679	15,547
Long-term debt	15,975	15,975	19,253
Other noncurrent obligations	6,547	6,547	4,709
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents at end of year	37	37	71
Other current assets	51	51	101
Net property	330	330	683
Other noncurrent assets	18	18	14
Total Assets	436	436	869
Current liabilities (less than $1 million at 12/31/2017)	141	141	307
Long-term debt	34	34	75
Other noncurrent obligations	21	21	14
Total liabilities	196	$ 196	$ 396
MTP HPPO [Member]
Variable Interest Entity [Line Items]
Payments to Noncontrolling Interests	$ 166