STATEMENT OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income (loss) including noncontrolling interests	$ (4,904)	$ (3,682)	$ 286
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Pension and postretirement benefit plan	(2)	13	0
Share of equity method interests other comprehensive loss	0	(1)	0
Other comprehensive income, net of tax	(2)	12	0
COMPREHENSIVE INCOME (LOSS) INCLUDING NONCONTROLLING INTERESTS	(4,906)	(3,670)	286
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCK	(4,862)	(3,541)	40
Redeemable Noncontrolling Interest - Altus Preferred Unit Limited Partners
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Comprehensive income (loss) attributable to noncontrolling interest	76	38	0
Noncontrolling Interest, Egypt
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Comprehensive income (loss) attributable to noncontrolling interest	(121)	167	245
Noncontrolling Interest, Altus
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Comprehensive income (loss) attributable to noncontrolling interest	$ 1	$ (334)	$ 1