Discontinued Operation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations attributable to common shareowners	$ (7)	$ 113	$ (34)	$ (399)
Income (loss) from discontinued operations, before tax	(1)	13	(31)	(219)
Income tax expense (benefit) from discontinued operations	6	(100)	3	137
Income (Loss) from discontinued operations	(7)	113	(34)	(356)
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	0	0	43
Net cash used in operating activities			(27)	(693)
Net cash used in investing activities			0	(241)
Net cash provided by (used in) financing activities			27	(1,449)
Otis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations attributable to common shareowners	0	0	0	187
Selling, general and administrative expense	0	0	0	450
Other income (expense), net	0	0	0	(65)
Income (loss) from discontinued operations, before tax	0	0	0	340
Income tax expense (benefit) from discontinued operations	0	0	0	116
Income (Loss) from discontinued operations	0	0	0	224
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	0	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	0	0	38
Otis [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating expense (income), net	0	0	0	3
Otis [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	0	0	1,123
Costs of Goods Sold	0	0	0	913
Otis [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	0	0	1,843
Costs of Goods Sold	0	0	0	1,157
Carrier [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations attributable to common shareowners	0	0	0	196
Selling, general and administrative expense	0	0	0	669
Other income (expense), net	0	0	0	(30)
Income (loss) from discontinued operations, before tax	0	0	0	304
Income tax expense (benefit) from discontinued operations	0	0	0	102
Income (Loss) from discontinued operations	0	0	0	202
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	0	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	0	0	98
Carrier [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating expense (income), net	0	0	0	17
Carrier [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	0	0	3,143
Costs of Goods Sold	0	0	0	2,239
Carrier [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales	0	0	0	741
Costs of Goods Sold	0	0	0	527
Separation related transactions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations attributable to common shareowners	(7)	113	(34)	(782)
Selling, general and administrative expense	1	(13)	31	154
Income (loss) from discontinued operations, before tax	(1)	13	(31)	(863)
Income tax expense (benefit) from discontinued operations	6	(100)	3	(81)
Separation related transactions | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-operating expense (income), net	$ 0	$ 0	$ 0	$ 709