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Acquisitions (Details)						3 Months Ended		6 Months Ended
Acquisitions (Details)	Jun. 11, 2019 USD ($)	Jan. 29, 2019 USD ($)	Nov. 20, 2018 GBP (£) £ / shares	Apr. 30, 2018 USD ($)	Apr. 16, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 GBP (£)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Operating Lease, Payments								$ 35,000,000
Interest Expense						$ 89,000,000	$ 57,000,000	198,000,000	$ 119,000,000
Payments to Acquire Businesses, Net of Cash Acquired								763,000,000	418,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High											$ 959,000,000
Business Combination, Contingent Consideration, Liability											394,000,000	$ 347,000,000
Goodwill											8,451,000,000	$ 7,911,000,000
Proposed BTG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price \| £ / shares			£ 8.40
Payments to Acquire Businesses, Net of Cash Acquired			£ 3,311,000,000			$ 4,204,000,000
Exchange Rate, USD											1.27
Exchange Rate, GBP \| £										£ 1.00
Vertiflex, Inc. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 465,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 100,000,000
Millipede, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 90,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		20.00%
Payments to Acquire Businesses, Gross		$ 325,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 125,000,000
2019 Acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired								763,000,000
Business Combination, Contingent Consideration, Liability											131,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value								103,000,000
Goodwill											540,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets											295,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets											24,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities											(12,000,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities											(68,000,000)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination								997,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles											$ 217,000,000
Intangible Assets Acquired, Finite and Indefinite-lived								512,000,000
2019 Acquisitions [Member] \| Purchased research and development [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired								295,000,000
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										20.00%	20.00%
2019 Acquisitions [Member] \| Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired								$ 207,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								12 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										15.00%	15.00%
2019 Acquisitions [Member] \| Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired								$ 10,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								12 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										15.00%	15.00%
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired								$ 419,000,000
Business Combination, Contingent Consideration, Liability											$ 140,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value								82,000,000
Goodwill											272,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets											11,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities											(5,000,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities											(55,000,000)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination								641,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles											$ 418,000,000
2018 Acquisitions [Member] \| Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired								$ 411,000,000
2018 Acquisitions [Member] \| Technology-Based Intangible Assets [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								10 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										17.00%	17.00%
2018 Acquisitions [Member] \| Technology-Based Intangible Assets [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								13 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										23.00%	23.00%
2018 Acquisitions [Member] \| Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired								$ 7,000,000
2018 Acquisitions [Member] \| Other Intangible Assets [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								6 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										13.00%	13.00%
2018 Acquisitions [Member] \| Other Intangible Assets [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								13 years
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation										15.00%	15.00%
NxThera [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 240,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				$ 85,000,000
nVision [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross					$ 150,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					$ 125,000,000
Other 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross									50,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High							$ 10,000,000		$ 10,000,000