Leases Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating Lease, Cost	$ 158	$ 197
Finance Lease, Right-of-Use Asset, Amortization	1	2
Finance Lease, Interest Expense	0	0
Finance Lease, Cost	1	2
Short-term Lease, Cost	14	14
Variable Lease, Cost	8	7
Total Lease Cost	$ 181	$ 220