Acquisitions Purchase Price (Details) - USD ($) $ in Millions							12 Months Ended
	Dec. 30, 2021	Dec. 08, 2021	Sep. 30, 2021	Feb. 25, 2021	Jan. 15, 2021	Apr. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Purchase Price
Fair value of equity awards exchanged							$ 43
Fair value of contingent consideration							$ 183
Net Assets Acquired [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years)							14 years		14 years
Payments to Acquire Businesses, Net of Cash Acquired							$ 19,395	$ 38	$ 1,843
Customer Relationships [Member]
Net Assets Acquired [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years)							17 years		14 years
Product Technology [Member]
Net Assets Acquired [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years)							11 years		13 years
Tradenames [Member]
Net Assets Acquired [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years)							7 years		2 years
Backlog [Member]
Net Assets Acquired [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in years)							3 years
PPD, Inc. [Member]
Purchase Price
Cash paid		$ 17,237
Fair value of equity awards exchanged		43
Cash acquired		(1,244)
Total purchase price		16,036
Net Assets Acquired [Abstract]
Current assets		2,510
Property, plant and equipment		562
Goodwill		13,781
Other assets		1,108
Contract liabilities		(1,570)
Deferred tax liabilities		(1,803)
Finance lease liabilities		(86)
Debt assumed		(4,299)
Other liabilities assumed		(1,972)
Redeemable noncontrolling interest		(122)
Total net assets acquired		16,036
Payments to Acquire Businesses, Net of Cash Acquired		15,990
PPD, Inc. [Member] | Customer Relationships [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets		6,264
PPD, Inc. [Member] | Tradenames [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets		603
PPD, Inc. [Member] | Backlog [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets		$ 1,060
PeproTech, Inc. [Member]
Purchase Price
Cash paid	$ 1,947
Cash acquired	(83)
Total purchase price	1,864
Net Assets Acquired [Abstract]
Current assets	63
Property, plant and equipment	18
Goodwill	1,190
Other assets	11
Deferred tax liabilities	(193)
Other liabilities assumed	(21)
Total net assets acquired	1,864
Payments to Acquire Businesses, Net of Cash Acquired	1,860
PeproTech, Inc. [Member] | Customer Relationships [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets	514
PeproTech, Inc. [Member] | Product Technology [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets	$ 282
European Viral Vector Manufacturing Business [Member]
Purchase Price
Cash paid					$ 848
Cash acquired					(18)
Total purchase price					830
Net Assets Acquired [Abstract]
Current assets					39
Property, plant and equipment					59
Goodwill					600
Other assets					3
Contract liabilities					(59)
Deferred tax liabilities					(80)
Finance lease liabilities					(24)
Other liabilities assumed					(35)
Total net assets acquired					830
Payments to Acquire Businesses, Net of Cash Acquired					830
European Viral Vector Manufacturing Business [Member] | Customer Relationships [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets					302
European Viral Vector Manufacturing Business [Member] | Product Technology [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets					$ 25
Mesa Biotech [Member]
Purchase Price
Cash paid				$ 421
Fair value of contingent consideration				65
Cash acquired				(14)
Total purchase price				472
Net Assets Acquired [Abstract]
Current assets				54
Property, plant and equipment				2
Goodwill				237
Other assets				3
Deferred tax liabilities				(72)
Other liabilities assumed				(33)
Total net assets acquired				472
Payments to Acquire Businesses, Net of Cash Acquired				407
Mesa Biotech [Member] | Product Technology [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets				279
Mesa Biotech [Member] | Tradenames [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets				$ 2
Lengnau biologics manufacturing facility [Member]
Purchase Price
Cash paid			$ 17
Fair value of contingent consideration			1
Total purchase price			18
Net Assets Acquired [Abstract]
Property, plant and equipment			92
Goodwill			18
Other assets			376
Finance lease liabilities			(82)
Other liabilities assumed			(386)
Total net assets acquired			18
Lessee, Lease Liability Payments Due			$ 555
Brammer Bio [Member]
Purchase Price
Cash paid						$ 1,710
Cash acquired						(36)
Total purchase price						1,674
Net Assets Acquired [Abstract]
Current assets						52
Property, plant and equipment						147
Goodwill						938
Other assets						49
Contract liabilities						(110)
Deferred tax liabilities						(110)
Other liabilities assumed						(108)
Total net assets acquired						1,674
Goodwill, Expected Tax Deductible Amount						405
Brammer Bio [Member] | Customer Relationships [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets						744
Brammer Bio [Member] | Product Technology [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets						65
Brammer Bio [Member] | Tradenames [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets						$ 7
Other [Member]
Purchase Price
Cash paid							$ 298		$ 169
Fair value of contingent consideration							117
Cash acquired							(13)
Total purchase price							402	$ 63	169
Net Assets Acquired [Abstract]
Current assets							12		58
Property, plant and equipment							2		102
Goodwill							198		9
Other assets							2
Contract liabilities							(1)
Deferred tax liabilities							(28)		(6)
Other liabilities assumed							(11)		(1)
Total net assets acquired							402		169
Other [Member] | Customer Relationships [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets							2
Other [Member] | Product Technology [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets							224		$ 7
Other [Member] | Tradenames [Member]
Net Assets Acquired [Abstract]
Definite-lived intangible assets							$ 2