CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Investment in SNG (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 4,620	$ 5,098	$ 9,638	$ 10,510
Operating income	1,058	1,342	2,321	5,033
Net income	621	931	1,461	2,989
Equity Method Investment | SNG
Schedule of Equity Method Investments [Line Items]
Revenues	149	155	307	321
Operating income	78	86	176	192
Net income	$ 55	$ 64	$ 130	$ 148