Cost Reduction Programs and Other Charges - Schedule of Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 249	$ 141	$ 380	$ 230
Other charges, merger related		65		121
Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges		$ 76		$ 109
Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges			89
Other charges, merger related	36		89
Operating Segments | Americas
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	39		60
Operating Segments | Americas | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	6		6
Operating Segments | EMEA
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	113		142
Operating Segments | EMEA | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	(3)		0
Operating Segments | APAC
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	(4)		8
Operating Segments | APAC | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	(5)		3
Operating Segments | Engineering
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	21		36
Operating Segments | Engineering | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	7		8
Operating Segments | Other
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	80		134
Operating Segments | Other | Merger-related and other charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	31		72
Cost Reduction Program
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	213		291
Cost Reduction Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	192		250
Cost Reduction Program | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	21		41
Cost Reduction Program | Operating Segments | Americas
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	33		54
Cost Reduction Program | Operating Segments | Americas | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	25		31
Cost Reduction Program | Operating Segments | Americas | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	8		23
Cost Reduction Program | Operating Segments | EMEA
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	116		142
Cost Reduction Program | Operating Segments | EMEA | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	112		138
Cost Reduction Program | Operating Segments | EMEA | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	4		4
Cost Reduction Program | Operating Segments | APAC
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	1		5
Cost Reduction Program | Operating Segments | APAC | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	1		3
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	14		28
Cost Reduction Program | Operating Segments | Engineering | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	7		21
Cost Reduction Program | Operating Segments | Engineering | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	7		7
Cost Reduction Program | Operating Segments | Other
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	49		62
Cost Reduction Program | Operating Segments | Other | Severance costs
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	47		57
Cost Reduction Program | Operating Segments | Other | Other cost reduction charges
Restructuring Cost and Reserve [Line Items]
Cost reduction programs and other charges	$ 2		$ 5