Segment Information - Depreciation, store expense and capital expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment information
Depreciation and amortization	$ 220	$ 247	$ 209
Mechanical stores expense	57	57	57
Capital expenditures and mechanical stores purchases	328	350	314
North America
Segment information
Depreciation and amortization	146	180	140
Mechanical stores expense	40	38	37
Capital expenditures and mechanical stores purchases	226	232	180
South America
Segment information
Depreciation and amortization	22	24	27
Mechanical stores expense	10	11	12
Capital expenditures and mechanical stores purchases	45	61	50
Asia-Pacific
Segment information
Depreciation and amortization	37	27	25
Mechanical stores expense	4	5	5
Capital expenditures and mechanical stores purchases	40	39	51
EMEA
Segment information
Depreciation and amortization	15	16	17
Mechanical stores expense	3	3	3
Capital expenditures and mechanical stores purchases	$ 17	$ 18	$ 33