Leases - ROU Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets and Liabilities, Lessee [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets	Other long-term assets
Finance, ROU assets	$ 0	$ 9
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Finance, current lease liabilities	$ 0	$ 9
Finance, long-term lease liabilities	$ 0	$ 0
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Finance, present value of lease liabilities	$ 0	$ 9
Less amounts reclassified to liabilities subject to compromise	0	(9)
Finance Lease, Liability, Net	$ 0	$ 0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets	Other long-term assets
Operating, ROU assets	$ 38	$ 29
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Operating, current lease liabilities	$ 29	$ 27
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Operating, long-term lease liabilities	$ 9	$ 2
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities
Operating, present value of lease liabilities	$ 38	$ 29
Less amounts reclassified to liabilities subject to compromise	0	(5)
Operating Lease, Liability, Net	$ 38	$ 24