CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTS - Investment in SNG (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 5,620	$ 5,995	$ 15,258	$ 16,505
Operating income	1,835	2,013	4,156	7,046
Net income	1,283	1,345	2,746	4,335
Equity Method Investment | SNG
Schedule of Equity Method Investments [Line Items]
Revenues	150	152	457	473
Operating income	85	82	262	274
Net income	$ 59	$ 60	$ 189	$ 208