Revenues - Disaggregation of revenues on geographic location of customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue
Revenues	$ 436	$ 437	$ 1,279	$ 1,302
U.S.
Revenue
Revenues	372	363	1,062	1,058
Australia
Revenue
Revenues	5	9	38	57
Asia
Revenue
Revenues	24	25	71	67
Middle East
Revenue
Revenues	15	13	45	40
Europe
Revenue
Revenues	14	18	41	54
Canada
Revenue
Revenues	3	3	12	8
Other.
Revenue
Revenues	$ 3	$ 6	$ 10	$ 18