Leases - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Short-term lease costs	$ 121	$ 170
Long-term lease costs	64	75
Variable lease costs	33	23
Amortization of ROU assets	3	0
Total lease costs	221	268
Cash paid for amounts included in the measurement of operating lease liabilities	73	100
ROU assets obtained in exchange for new operating lease liabilities	15	46
ROU assets obtained in exchange for new finance lease liabilities	28	0
Reductions to ROU assets resulting from modifications or cancellations of operating leases	(13)	(68)
Finance leases	$ 28	$ 0