Discontinued Operation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ (8)	$ 9	$ (27)	$ (512)
Income (loss) from discontinued operations, before tax	(10)	(56)	(30)	(232)
Income tax (benefit) expense from discontinued operations	(2)	(65)	(3)	237
Income (Loss) from discontinued operations	(8)	9	(27)	(469)
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	0	0	43
Net cash used in operating activities			(24)	(661)
Net cash used in investing activities			0	(241)
Net cash provided by (used in) financing activities			24	(1,481)
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 (benefit) expense 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 (income) expense, 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 (benefit) expense 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 (income) expense, 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	3,144
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	740
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	(8)	9	(27)	(895)
Selling, general and administrative expense	10	13	30	167
Income (loss) from discontinued operations, before tax	(10)	(56)	(30)	(876)
Income tax (benefit) expense from discontinued operations	(2)	(65)	(3)	19
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	$ 43	$ 0	$ 709