Leases - Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating cash flow for operating leases	$ 129	$ 52
Financing cash flow for finance leases	6	4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	88	63
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 15	$ 6