Borrowing and Lines of Credit (Narrative) (Details) - USD ($)		3 Months Ended
	Mar. 20, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Line of Credit Facility [Line Items]
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
Commercial paper		500,000,000		$ 0
2.20B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,200,000,000
Termination Date		Apr. 03, 2020
2.15B Multicurrency Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,150,000,000
Termination Date		Apr. 03, 2020
2.0B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,000,000,000.0
4.0B Term Credit Agreement [Member]
Line of Credit Facility [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
5.0B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity		$ 5,000,000,000.0
Line of Credit Facility, Expiration Date		Apr. 03, 2025
Line of Credit Facility, Initiation Date		Mar. 16, 2020
500M term credit agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date		Jun. 18, 2020
Line of Credit Facility, Expiration Terms		the date that is 30 days after the Raytheon Merger
Line of Credit Facility, Initiation Date	Mar. 20, 2020	Mar. 23, 2020
Repayment of Debt, Date		Apr. 28, 2020
Repayments of Debt		$ 500,000,000
1.0B Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date		Feb. 10, 2020
Carrier Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,000,000,000.0
Otis Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500,000,000
Line of Credit Facility, Expiration Date		Feb. 10, 2025
Borrowings [Member]
Line of Credit Facility [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
1.0B Credit Agreement - Otis [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date		Feb. 10, 2023
Termination Date		Mar. 27, 2020
1.75B Credit Agreement - Carrier [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date		Feb. 10, 2023
Termination Date		Mar. 27, 2020
Line of Credit - Otis [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,000,000,000.0
Line of Credit - Carrier [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,750,000,000
$2.0B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity		$ 2,000,000,000.0
Line of Credit Facility, Expiration Date		Feb. 10, 2025
Line of Credit Facility, Initiation Date		May 06, 2020
Termination Date		May 05, 2021