Borrowings and Lines of Credit (Short-Term Borrowings) (Details) - USD ($)			3 Months Ended
	Apr. 03, 2020	Mar. 20, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Short-term Debt [Line Items]
Commercial paper			$ 500,000,000		$ 0
Other borrowings			1,225,000,000		2,364,000,000
Total short-term borrowings			1,725,000,000		$ 2,364,000,000
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity			4,350,000,000
Maximum Commercial Paper Borrowing Authority			4,350,000,000
Repayments of Debt			13,947,000,000	$ 2,702,000,000
Carrier & Otis Separation [Member]
Short-term Debt [Line Items]
Business Separation, Effective Date of Separation	Apr. 03, 2020
2.20B Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,200,000,000
Termination Date			Apr. 03, 2020
4.0B Term Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 4,000,000,000.0
Line of Credit Facility, Revolving Credit Conversion to Term Loan, Description			500 million
Borrowings [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,100,000,000
Line of Credit Facility, Revolving Credit Conversion to Term Loan, Description			1.0 billion
Otis Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Feb. 10, 2025
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,500,000,000
Carrier Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,000,000,000.0
500M term credit agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Jun. 18, 2020
Line of Credit Facility, Initiation Date		Mar. 20, 2020	Mar. 23, 2020
Line of Credit Facility, Expiration Terms			the date that is 30 days after the Raytheon Merger
Repayment of Debt, Date			Apr. 28, 2020
Repayments of Debt			$ 500,000,000
5.0B Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Apr. 03, 2025
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity			$ 5,000,000,000.0
Line of Credit Facility, Initiation Date			Mar. 16, 2020
$2.0B Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Feb. 10, 2025
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity			$ 2,000,000,000.0
Line of Credit Facility, Initiation Date			May 06, 2020
Termination Date			May 05, 2021
1.0B Credit Agreement - Otis [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Feb. 10, 2023
Termination Date			Mar. 27, 2020
2.0B Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,000,000,000.0
2.15B Multicurrency Revolving Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 2,150,000,000
Termination Date			Apr. 03, 2020
1.0B Credit Agreement [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Initiation Date			Feb. 10, 2020
Line of Credit - Otis [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,000,000,000.0
Line of Credit - Carrier [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,750,000,000
1.75B Credit Agreement - Carrier [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Date			Feb. 10, 2023
Termination Date			Mar. 27, 2020