Revenues - Disaggregation of revenues on geographic location of customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue
Revenues	$ 438	$ 473	$ 843	$ 865
U.S.
Revenue
Revenues	355	372	690	695
Australia
Revenue
Revenues	26	37	33	48
Asia
Revenue
Revenues	25	20	47	42
Middle East
Revenue
Revenues	15	13	30	27
Europe
Revenue
Revenues	10	21	27	36
Canada
Revenue
Revenues	3	2	9	5
Other.
Revenue
Revenues	$ 4	$ 8	$ 7	$ 12