Commitments and Contingencies - Location and Amounts of Leases (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Right of use assets	$ 426	$ 494
Liabilities
Other current liabilities	96	100
Lease liabilities – non-current	$ 492	$ 544
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current	Other Liabilities, Current