Cost Reduction Programs and Other Charges - Schedule of Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 204	$ 249	$ 196	$ 380
Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges		$ 192		$ 250
Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		(52)
Operating Segments | Americas
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		5
Operating Segments | Americas | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		0
Operating Segments | EMEA
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	183		203
Operating Segments | EMEA | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		0
Operating Segments | APAC
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	5		(44)
Operating Segments | APAC | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		(53)
Operating Segments | Engineering
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	6		13
Operating Segments | Engineering | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		0
Operating Segments | Other
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	10		19
Operating Segments | Other | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		1
Cost Reduction Program
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	204		248
Cost Reduction Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	182		208
Cost Reduction Program | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	22		40
Cost Reduction Program | Operating Segments | Americas
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		5
Cost Reduction Program | Operating Segments | Americas | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		3
Cost Reduction Program | Operating Segments | Americas | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		2
Cost Reduction Program | Operating Segments | EMEA
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	183		203
Cost Reduction Program | Operating Segments | EMEA | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	169		182
Cost Reduction Program | Operating Segments | EMEA | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	14		21
Cost Reduction Program | Operating Segments | APAC
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	5		9
Cost Reduction Program | Operating Segments | APAC | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	5		7
Cost Reduction Program | Operating Segments | APAC | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		2
Cost Reduction Program | Operating Segments | Engineering
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	6		13
Cost Reduction Program | Operating Segments | Engineering | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	0		7
Cost Reduction Program | Operating Segments | Engineering | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	6		6
Cost Reduction Program | Operating Segments | Other
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	10		18
Cost Reduction Program | Operating Segments | Other | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	8		9
Cost Reduction Program | Operating Segments | Other | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 2		$ 9