Employee benefit plans (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Health care benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0	$ 0
Interest cost	1	1	1	3	3
Expected return on assets	(2)	(1)	(2)	(5)	(5)
Other	(1)	(1)	0	(3)	0
Net periodic benefit (credit) cost	(2)	(1)	(1)	(5)	(2)
Domestic | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0	0
Interest cost	35	35	35	105	103
Expected return on assets	(78)	(78)	(75)	(234)	(225)
Other	17	17	24	51	73
Net periodic benefit (credit) cost	(26)	(26)	(16)	(78)	(49)
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	4	9	11
Interest cost	6	7	6	21	19
Expected return on assets	(8)	(9)	(9)	(27)	(26)
Other	1	1	3	3	10
Net periodic benefit (credit) cost	$ 2	$ 2	$ 4	$ 6	$ 14