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Inventories- Narrative (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
Inventories- Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Inventory [Line Items]
Restructuring charges	$ 5	$ 32	$ 34	$ 19	$ 96	$ 15
Motorparts
Inventory [Line Items]
Inventory write-down							$ 44	$ 82
Motorparts \| North America \| Supply Chain Rationalization
Inventory [Line Items]
Restructuring charges								4
Motorparts \| North America \| Other restructuring
Inventory [Line Items]
Restructuring charges							3	4
Motorparts \| Operating Segments
Inventory [Line Items]
Impairment of property, plant and equipment				$ 1			$ 1	1
Motorparts \| Operating Segments \| Supply Chain Rationalization
Inventory [Line Items]
Impairment of property, plant and equipment								16
Operating lease impairment								$ 9