CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (591)	$ (568)	$ (1,257)
Net income (loss) attributable to noncontrolling interest	1	(1)	(2)
Net loss attributable to controlling interest	(592)	(567)	(1,255)
Components of net periodic benefit income (costs) before reclassifications	175	38	(25)
Components of net periodic benefit costs reclassified to net loss	10	25	4
Other comprehensive income (loss) before income taxes	185	63	(21)
Income taxes related to other comprehensive income (loss)	(6)	(2)
Other comprehensive income (loss)	179	61	(21)
Other comprehensive income attributable to controlling interest	179	61	(21)
Total comprehensive loss	(412)	(507)	(1,278)
Total comprehensive income (loss) attributable to noncontrolling interest	1	(1)	(2)
Total comprehensive loss attributable to controlling interest	$ (413)	$ (506)	$ (1,276)