Divestitures (Details) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) business	Dec. 31, 2019 business	Jun. 30, 2019 USD ($) business	Jun. 30, 2020 USD ($) business	Jun. 30, 2019 USD ($) business	Dec. 31, 2019 USD ($) business $ / shares	Mar. 31, 2020 business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain on disposal | $				$ 1	$ (6)
Disposal group, held-for-sale | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $	$ 40		$ 51	$ 90	$ 102
Number of businesses held for sale | business		3	6		6	3
Number of businesses divested | business		3				3
Pre-tax gain on disposal | $						$ 44
Gain after tax | $						$ 30
Operating revenue after tax per diluted share (in dollars per share) | $ / shares						$ 0.09
Disposal group, held-for-sale | Test & Measurement and Electronics | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses held for sale | business	1	1	2	1	2	1
Number of businesses divested | business		1
Disposal group, held-for-sale | Automotive OEM | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses held for sale | business		1	1		1	1	1
Disposal group, held-for-sale | Welding | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses held for sale | business			1		1
Number of businesses divested | business		1
Disposal group, held-for-sale | Specialty Products | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses held for sale | business		1	2		2	1	1
Number of businesses divested | business		1
Disposal group, disposed of by sale, not discontinued operations | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $			$ 37		$ 73
Disposal group, disposed of by sale, not discontinued operations | Test & Measurement and Electronics | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $			17		33
Disposal group, disposed of by sale, not discontinued operations | Welding | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $			16		31
Disposal group, disposed of by sale, not discontinued operations | Specialty Products | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $			$ 4		$ 9
Maximum | Disposal group, held-for-sale | 2019 Divestitures Plan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue | $				$ 1,000