Borrowing and Lines of Credit (Narrative) (Details)	6 Months Ended
	Jun. 30, 2020 USD ($)
Line of Credit Facility [Line Items]
Maximum Commercial Paper Borrowing Authority	$ 5,000,000,000.0
Repayments of Debt	15,174,000,000
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity	7,000,000,000.0
Debt Exchanged	$ 8,200,000,000
$500M Term Loan Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	May 05, 2020
Line of Credit Facility, Initiation Date	Mar. 20, 2020
Termination of Credit Agreement	$ 500,000,000
2.20B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	5,000,000,000.0
2.15B Multicurrency Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination of Credit Agreement	2,150,000,000
2.0B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination of Credit Agreement	2,200,000,000
4.0B Term Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination of Credit Agreement	$ 4,000,000,000.0
500M term credit agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Apr. 28, 2020
Line of Credit Facility, Initiation Date	Mar. 23, 2020
1.0B Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000,000.0
Borrowings [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,100,000,000
1.0B Credit Agreement - Otis [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Feb. 10, 2023
Line of Credit Facility, Initiation Date	Feb. 10, 2020
1.75B Credit Agreement - Carrier [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Feb. 10, 2023
Line of Credit Facility, Initiation Date	Feb. 10, 2020
Termination of Credit Agreement	$ 1,750,000,000
Line of Credit - Otis [Member]
Line of Credit Facility [Line Items]
Termination of Credit Agreement	1,000,000,000.0
$2.0B revolving credit agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000.0
Line of Credit Facility, Expiration Date	Feb. 11, 2020
Termination of Credit Agreement	$ 2,000,000,000.0
$4.0B Term Loan Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Mar. 03, 2020
$2.20B Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Apr. 03, 2020