Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost
Depreciation of leased assets	$ 78	$ 55
Interest of lease liabilities	6	6
Operating lease cost	17	24
Sub-lease income from real estate properties owned and leased	(5)	(6)
Total lease cost	$ 96	$ 79