Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCL") by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
AOCL, Beginning Balance	$ (13)	$ (9)
Other comprehensive (loss) income before reclassifications		4
Amounts reclassified from AOCL	(2)	(8)
Other comprehensive (loss) income	(2)	(4)	$ 1
AOCL, Ending Balance	(14)	(13)	(9)
Change in Fair Value of Available for Sale Debt Securities
Accumulated Other Comprehensive Income Loss [Line Items]
AOCL, Beginning Balance	2	(3)
Other comprehensive (loss) income before reclassifications	(1)	6
Amounts reclassified from AOCL	(4)	2
Other comprehensive (loss) income	(5)	4
AOCL, Ending Balance	(2)	2	(3)
Change in Unrecognized Pension Cost Components
Accumulated Other Comprehensive Income Loss [Line Items]
AOCL, Beginning Balance	(15)	(8)
Other comprehensive (loss) income before reclassifications	1	(1)
Amounts reclassified from AOCL	2	(6)
Other comprehensive (loss) income	3	(7)
AOCL, Ending Balance	$ (12)	(15)	(8)
Change in Fair Value of Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
AOCL, Beginning Balance		2
Other comprehensive (loss) income before reclassifications		(1)
Other comprehensive (loss) income		$ (1)
AOCL, Ending Balance			$ 2