Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents					$ 2,441
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net					5,627
Disposal Group, Including Discontinued Operation, Contract Assets					1,209
Disposal Group, Including Discontinued Operation, Inventory, Current					1,903
Disposal Group, Including Discontinued Operation, Other Assets, Current					434
Disposal Group, Including Discontinued Operation, Deferred Tax Assets					725
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent					2,433
Disposal Group, Including Discontinued Operation, Operating Lease Right-of-Use Assets					1,347
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent					11,454
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent					1,573
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent					2,677
Disposal Group, Including Discontinued Operation, Assets					31,823
Disposal Group, Including Discontinued Operation, Accounts Payable, Current					3,003
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current					4,540
Disposal Group, Including Discontinued Operation, Short-term Borrowings					71
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current					2,899
Disposal Group, Including Discontinued Operation, Long-term Debt Currently Due					238
Disposal Group, Including Discontinued Operation, Long-term Debt					87
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent					1,015
Disposal Group, Including Discontinued Operation, Operating Lease Liabilities					1,051
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent					1,539
Disposal Group, Including Discontinued Operation, Liabilities					14,443
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities					145
Income (loss) from discontinued operations	$ (56)	$ 1,206	$ (232)	$ 2,114
Income tax expense (benefit) from discontinued operations	(65)	435	237	679
Income (loss) from discontinued operations, net of tax	9	771	(469)	1,435
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	54	43	84
Income (loss) from discontinued operations attributable to common shareowners	9	717	(512)	1,351
Portfolio separation costs			1,345
Net cash provided by (used in) operating activities			(661)	841
Net cash used in investing activities			(241)	(114)
Net cash used in financing activities			(1,481)	(698)
Income from discontinued operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portfolio separation costs			876
Income tax expense from discontinued operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portfolio separation costs			19
Income from continuing operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portfolio separation costs			35
Income tax expense [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portfolio separation costs			415
Otis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents					1,446
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net					2,899
Disposal Group, Including Discontinued Operation, Contract Assets					530
Disposal Group, Including Discontinued Operation, Inventory, Current					571
Disposal Group, Including Discontinued Operation, Other Assets, Current					213
Disposal Group, Including Discontinued Operation, Deferred Tax Assets					355
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent					747
Disposal Group, Including Discontinued Operation, Operating Lease Right-of-Use Assets					529
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent					1,647
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent					490
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent					220
Disposal Group, Including Discontinued Operation, Assets					9,647
Disposal Group, Including Discontinued Operation, Accounts Payable, Current					1,321
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current					1,651
Disposal Group, Including Discontinued Operation, Short-term Borrowings					33
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current					2,288
Disposal Group, Including Discontinued Operation, Long-term Debt Currently Due					1
Disposal Group, Including Discontinued Operation, Long-term Debt					5
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent					560
Disposal Group, Including Discontinued Operation, Operating Lease Liabilities					383
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent					514
Disposal Group, Including Discontinued Operation, Liabilities					6,756
Disposal Group, Including Discontinued Operation, Revenue	0	3,348	2,966	6,444
Disposal Group, Including Discontinued Operation, General and Administrative Expense	0	471	450	913
Disposal Group, Including Discontinued Operation, Other Expense	0	(19)	(65)	(25)
Income (loss) from discontinued operations	0	445	340	849
Income tax expense (benefit) from discontinued operations	0	140	116	256
Income (loss) from discontinued operations, net of tax	0	305	224	593
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	45	37	71
Income (loss) from discontinued operations attributable to common shareowners	0	260	187	522
Otis [Member] | Research and Development Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	0	35	38	79
Otis [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Expense	0	(4)	(3)	(8)
Otis [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	1,224	913	2,286
Otis [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	1,150	1,157	2,284
Carrier [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents					995
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net					2,728
Disposal Group, Including Discontinued Operation, Contract Assets					679
Disposal Group, Including Discontinued Operation, Inventory, Current					1,332
Disposal Group, Including Discontinued Operation, Other Assets, Current					221
Disposal Group, Including Discontinued Operation, Deferred Tax Assets					370
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent					1,686
Disposal Group, Including Discontinued Operation, Operating Lease Right-of-Use Assets					818
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent					9,807
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent					1,083
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent					2,457
Disposal Group, Including Discontinued Operation, Assets					22,176
Disposal Group, Including Discontinued Operation, Accounts Payable, Current					1,682
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current					2,889
Disposal Group, Including Discontinued Operation, Short-term Borrowings					38
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current					611
Disposal Group, Including Discontinued Operation, Long-term Debt Currently Due					237
Disposal Group, Including Discontinued Operation, Long-term Debt					82
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation, Noncurrent					455
Disposal Group, Including Discontinued Operation, Operating Lease Liabilities					668
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent					1,025
Disposal Group, Including Discontinued Operation, Liabilities					$ 7,687
Disposal Group, Including Discontinued Operation, Revenue	0	4,956	3,884	9,273
Disposal Group, Including Discontinued Operation, General and Administrative Expense	0	735	669	1,420
Disposal Group, Including Discontinued Operation, Other Expense	0	115	(30)	170
Income (loss) from discontinued operations	0	762	304	1,268
Income tax expense (benefit) from discontinued operations	0	209	102	339
Income (loss) from discontinued operations, net of tax	0	553	202	929
Less: Noncontrolling interest in subsidiaries’ earnings from discontinued operations	0	9	6	13
Income (loss) from discontinued operations attributable to common shareowners	0	544	196	916
Carrier [Member] | Research and Development Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense	0	103	98	200
Carrier [Member] | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Expense	0	12	(17)	22
Carrier [Member] | Product [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	2,901	2,239	5,463
Carrier [Member] | Service [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	582	527	1,114
Separation related transactions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, General and Administrative Expense	13	0	167	0
Income (loss) from discontinued operations	(56)	0	(876)	0
Income tax expense (benefit) from discontinued operations	(65)	87	19	87
Income (loss) from discontinued operations attributable to common shareowners	9	(87)	(895)	(87)
Separation related transactions | Nonoperating Income (Expense)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Expense	$ (43)	$ 0	$ (709)	$ 0