Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations attributable to common shareowners	$ (19)	$ (521)
Income (loss) from discontinued operations, before tax	(20)	(176)
Income tax (benefit) expense from discontinued operations	(1)	302
Income (Loss) from discontinued operations	(19)	(478)
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	43
Net cash used in operating activities	(5)	(472)
Net cash used in investing activities	0	(241)
Net cash provided by financing activities	5	322
Otis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations attributable to common shareowners	0	187
Selling, general and administrative expense	0	450
Other income (expense), net	0	(65)
Income (loss) from discontinued operations, before tax	0	340
Income tax (benefit) expense from discontinued operations	0	116
Income (Loss) from discontinued operations	0	224
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	37
Otis [Member] | Research and Development Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Research and development	0	38
Otis [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating (income) expense, net	0	3
Otis [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	1,123
Costs of Goods Sold	0	913
Otis [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	1,843
Costs of Goods Sold	0	1,157
Carrier [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations attributable to common shareowners	0	196
Selling, general and administrative expense	0	669
Other income (expense), net	0	(30)
Income (loss) from discontinued operations, before tax	0	304
Income tax (benefit) expense from discontinued operations	0	102
Income (Loss) from discontinued operations	0	202
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	6
Carrier [Member] | Research and Development Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Research and development	0	98
Carrier [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating (income) expense, net	0	17
Carrier [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	3,143
Costs of Goods Sold	0	2,239
Carrier [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	741
Costs of Goods Sold	0	527
Separation related transactions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations attributable to common shareowners	(19)	(904)
Selling, general and administrative expense	20	154
Income (loss) from discontinued operations, before tax	(20)	(820)
Income tax (benefit) expense from discontinued operations	(1)	84
Separation related transactions | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating (income) expense, net	$ 0	$ 666