Acquisitions and Divestitures - Acquisitions (Details) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisitions Information
Accounts receivable			$ 100
Inventory			79
Other current assets			10
Property, plant and equipment			74
Purchased finite-lived intangible assets			855	$ 4
Purchased goodwill			1,302
Accounts payable and other liabilities			(100)
Deferred tax asset/(liability)			(297)
Net assets acquired			2,023
Supplemental information:
Cash paid			2,032
Less: Cash acquired			9
Cash paid, net of cash acquired		$ (13)	2,023	$ 16
Number of business combinations completed | item		0
Customer related intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			442
Other technology-based intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			127
Definite-lived tradenames
Business Acquisitions Information
Purchased finite-lived intangible assets			285
Other amortizable intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			$ 1
Maximum
Business Acquisitions Information
Intangible assets useful life			17 years	20 years
Minimum
Business Acquisitions Information
Intangible assets useful life			4 years	2 years
Weighted average
Business Acquisitions Information
Intangible assets useful life			15 years	8 years
Weighted average | Customer related intangible assets
Business Acquisitions Information
Intangible assets useful life			15 years
Weighted average | Other technology-based intangible assets
Business Acquisitions Information
Intangible assets useful life			10 years
Weighted average | Definite-lived tradenames
Business Acquisitions Information
Intangible assets useful life			17 years
Weighted average | Other amortizable intangible assets
Business Acquisitions Information
Intangible assets useful life			5 years
M*Modal | Subsequent Event
Supplemental information:
Cash paid	$ 700
Assumed debt	$ 300
Scott Safety
Business Acquisitions Information
Accounts receivable			$ 100
Inventory			79
Other current assets			10
Property, plant and equipment			74
Purchased goodwill			1,296
Accounts payable and other liabilities			(100)
Deferred tax asset/(liability)			(297)
Net assets acquired			2,011
Supplemental information:
Cash paid			2,020
Less: Cash acquired			9
Cash paid, net of cash acquired			2,011
Adjustments to purchase price allocation		$ 7
Annual sales prior to acquisition				$ 570
Scott Safety | Customer related intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			439
Scott Safety | Other technology-based intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			125
Scott Safety | Definite-lived tradenames
Business Acquisitions Information
Purchased finite-lived intangible assets			285
Capital Safety
Supplemental information:
Adjustments to the preliminary purchase price allocations within the allocation period primarily related to contingent liabilities and certain tax-related items				$ 35
Other Acquisitions
Business Acquisitions Information
Purchased goodwill			6
Net assets acquired			12
Supplemental information:
Cash paid			12
Cash paid, net of cash acquired			12
Other Acquisitions | Customer related intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			3
Other Acquisitions | Other technology-based intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			2
Other Acquisitions | Other amortizable intangible assets
Business Acquisitions Information
Purchased finite-lived intangible assets			$ 1