COMBINED STATEMENT OF EQUITY - USD ($) $ in Millions	Total Net Parent Investment	Net Parent Investment	Accumulated Other Comprehensive Income (Loss)	Non-Controlling Interests	Total
Balance at the beginning of the period at Dec. 31, 2019	$ 5,892	$ 7,112	$ (1,220)	$ 56	$ 5,948
Net income (loss) plus other comprehensive income (loss):
Net income (loss)	(1,293)	(1,293)			(1,293)
Other comprehensive income (loss)	18		18		18
Net transfers from Parent	786	786			786
Balance at the end of the period at Sep. 30, 2020	5,403	6,605	(1,202)	56	5,459
Balance at the beginning of the period at Jun. 30, 2020	5,369	6,699	(1,330)	54	5,423
Net income (loss) plus other comprehensive income (loss):
Net income (loss)	(238)	(238)			(238)
Other comprehensive income (loss)	128		128		128
Net transfers from Parent	145	145			145
Changes in noncontrolling interests				2	2
Balance at the end of the period at Sep. 30, 2020	5,403	6,605	(1,202)	56	5,459
Balance at the beginning of the period at Dec. 31, 2020	4,873	5,972	(1,100)	58	4,931
Net income (loss) plus other comprehensive income (loss):
Net income (loss)	(1,579)	(1,579)			(1,579)
Other comprehensive income (loss)	(178)		(178)		(178)
Net transfers from Parent	2,314	2,652	(338)		2,314
Changes in noncontrolling interests				(7)	(7)
Balance at the end of the period at Sep. 30, 2021	5,430	7,045	(1,615)	51	5,481
Balance at the beginning of the period at Jun. 30, 2021	4,822	5,985	(1,163)	53	4,875
Net income (loss) plus other comprehensive income (loss):
Net income (loss)	(692)	(692)			(692)
Other comprehensive income (loss)	(114)		(114)		(114)
Net transfers from Parent	1,414	1,752	(338)		1,414
Changes in noncontrolling interests				(2)	(2)
Balance at the end of the period at Sep. 30, 2021	$ 5,430	$ 7,045	$ (1,615)	$ 51	$ 5,481