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Acquisitions and Divestitures - Divestitures (Details) $ in Millions	1 Months Ended										3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) item	May 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Divestiture Information
Proceeds from sale of businesses												$ 236	$ 846	$ 1,065
Disposal Group, Held-for-sale, Not Discontinued Operations
Divestiture Information
Disposal - Inventory	$ 70											70
Disposal - Property, plant and equipment	150											150
Disposal - Intangible assets	35											35
Disposal - Goodwill	30											30
Aggregate operating income of divested businesses												$ 40	$ 85	$ 115
Identity Management Business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business									$ 205
Safety Prescription Eyewear Business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business										$ 45
Pre-tax gain on sale											$ 29
Identity Management and Tolling and Automated License Number Plate Recognition Business in Aggregate \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Number of businesses sold \| item								2
Proceeds from divested businesses								$ 833
Proceeds from divested businesses, net of cash sold								809
Pre-tax gain on sale								458
Tolling and Automated License Number Plate Recognition Business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business								$ 40
Electronic Monitoring Business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business							$ 95
Aggregate selling price relative to the divestiture transaction							201
Pre-tax gain on sale							$ 98
Communication Markets Division \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business				$ 400
Proceeds from divested businesses				772
Pre-tax gain on sale			$ 15
Estimated pre-tax gain on sale				$ 494
Personal Safety Product Offerings \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business						$ 15
Abrasives glass products business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business					$ 10
Pre-tax gain on sale					$ 15
Gas and flame detection business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business		$ 120
Drug delivery business \| Disposal Group, Held-for-sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business	380
Proceeds from sale of businesses	650
Pre-tax gain on sale	$ 400
Noncontrolling interest in new company (as a percent)	17.00%											17.00%
Advanced ballistic protection business \| Disposal Group, Held-for-sale, Not Discontinued Operations
Divestiture Information
Annual sales of divested business												$ 85
Proceeds from sale of businesses												91
Maximum contingent considerations depending on outcome of pending tenders	$ 25											$ 25
Safety and Industrial \| Personal Safety Product Offerings \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Maximum
Divestiture Information
Pre-tax gain on sale						$ 20
Safety and Industrial \| Gas and flame detection business \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Divestiture Information
Pre-tax gain on sale		$ 112