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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 27,019	$ 26,874
Purchase adjustments, measurement period adjustments, and other		154
Foreign currency translation	1,218	(144)
Disposals	(49)
Goodwill, ending balance	28,201	27,019
Americas
Goodwill [Roll Forward]
Goodwill, beginning balance	9,042	9,174
Purchase adjustments, measurement period adjustments, and other		(255)
Foreign currency translation	35	(12)
Disposals	(7)
Goodwill, ending balance	9,083	9,042
EMEA
Goodwill [Roll Forward]
Goodwill, beginning balance	10,243	10,960
Purchase adjustments, measurement period adjustments, and other		(636)
Foreign currency translation	643	(81)
Disposals	(42)
Goodwill, ending balance	10,844	10,243
APAC
Goodwill [Roll Forward]
Goodwill, beginning balance	4,957	5,295
Purchase adjustments, measurement period adjustments, and other		(323)
Foreign currency translation	305	(15)
Disposals	0
Goodwill, ending balance	5,262	4,957
Engineering
Goodwill [Roll Forward]
Goodwill, beginning balance	2,470	1,075
Purchase adjustments, measurement period adjustments, and other		1,410
Foreign currency translation	212	(15)
Disposals	0
Goodwill, ending balance	2,682	2,470
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	307	370
Purchase adjustments, measurement period adjustments, and other		(42)
Foreign currency translation	23	(21)
Disposals	0
Goodwill, ending balance	330	307
2018 Non-Merger Related Acquisitions
Goodwill [Roll Forward]
Acquisitions (Note 2)	13	135
2018 Non-Merger Related Acquisitions | Americas
Goodwill [Roll Forward]
Acquisitions (Note 2)	13	135
2018 Non-Merger Related Acquisitions | EMEA
Goodwill [Roll Forward]
Acquisitions (Note 2)	0	0
2018 Non-Merger Related Acquisitions | APAC
Goodwill [Roll Forward]
Acquisitions (Note 2)	0	0
2018 Non-Merger Related Acquisitions | Engineering
Goodwill [Roll Forward]
Acquisitions (Note 2)	0
2018 Non-Merger Related Acquisitions | Other
Goodwill [Roll Forward]
Acquisitions (Note 2)	$ 0	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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