Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Successor [Member]
Net income (loss)	$ 126			$ 225
Other comprehensive income (loss), net of tax	3			44
Comprehensive income (loss)	$ 129			$ 269
Predecessor [Member]
Net income (loss)		$ 15	$ 4,541		$ (352)
Other comprehensive income (loss), net of tax		155	359		(182)
Comprehensive income (loss)		$ 170	$ 4,900		$ (534)