Consolidated Statements Of Equity (Deficit) - USD ($) $ in Millions	Successor [Member] Common Stock [Member]	Successor [Member] Additional Paid-In Capital [Member]	Successor [Member] Retained Earnings (Deficit) [Member]	Successor [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Successor [Member]	Predecessor [Member] Common Stock [Member]	Predecessor [Member] Additional Paid-In Capital [Member]	Predecessor [Member] Retained Earnings (Deficit) [Member] Restatement Adjustment [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Predecessor [Member] Retained Earnings (Deficit) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Predecessor [Member] Retained Earnings (Deficit) [Member]	Predecessor [Member] Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Predecessor [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Predecessor [Member] Treasury Common Stock [Member]	Predecessor [Member] Restatement Adjustment [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Predecessor [Member]
Balance at beginning at Dec. 31, 2018						$ 27	$ 4,802	$ 11		$ (2,752)		$ (463)	$ (14)	$ 11	$ 1,600
Balance (in shares) at Dec. 31, 2018						106,025,000							(489,000)
Stock plans							13						$ 1		14
Stock plans (in shares)													(405,000)
Net income (loss)										(5,911)					(5,911)
Other comprehensive income (loss), net of tax												(108)			(108)
Balance at ending (Accounting Standards Update 2018-02 [Member]) at Dec. 31, 2019									$ 79		$ (79)	(79)
Balance at ending at Dec. 31, 2019						$ 27	4,815			(8,573)		(650)	$ (13)		(4,394)
Balance (in shares) at Dec. 31, 2019						106,025,000							(894,000)
Stock plans							2						$ (1)		1
Stock plans (in shares)													(338,000)
Net income (loss)										(402)					(402)
Other comprehensive income (loss), net of tax												(105)			(105)
Balance at ending at Dec. 31, 2020						$ 27	4,817			(8,975)		(755)	$ (14)		(4,900)
Balance (in shares) at Dec. 31, 2020						106,025,000							(1,232,000)
Stock plans							1						$ (1)
Stock plans (in shares)													(122,000)
Net income (loss)										4,541					4,541
Other comprehensive income (loss), net of tax												359			359
Cancellation of Predecessor equity						$ (27)	(4,818)			$ 4,434		$ 396	$ 15
Cancellation of Predecessor equity (in shares)						(106,025,000)							1,354,000
Issuance of Successor common stock						$ 2	4,106								$ 4,108
Issuance of Successor common stock (in shares)					244,401,000	244,401,000									244,401,000
Balance at ending at Apr. 30, 2021						$ 2	$ 4,106								$ 4,108
Balance (in shares) at Apr. 30, 2021						244,401,000
Stock plans		$ 18			$ 18
Stock plans (in shares)	15,000
Net income (loss)			$ 414		414
Other comprehensive income (loss), net of tax				$ 60	60
Balance at ending at Dec. 31, 2021	$ 2	$ 4,124	$ 414	$ 60	$ 4,600
Balance (in shares) at Dec. 31, 2021	244,416,000