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Borrowing and Lines of Credit (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum Commercial Paper Borrowing Authority |  | $ 5,000 |  | $ 5,000 |
Aggregate Line of Credit Agreements, Maximum Borrowing Capacity |  | 7,000 |  | 7,000 |
Debt Exchanged |  | $ 8,200 |  | $ 8,200 |
Average Years of Maturity of Long Term Debt |  |  |  | 14 years |
Average interest expense rate |  | 4.20% | 3.60% | 4.00% | 3.70%
Repayments of Debt |  |  |  | $ 15,174 | $ 600
Forecast [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Repayments of Debt | $ 1,000 |  |  |  |
5.0B Revolving Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 5,000 |  | $ 5,000 |
Line of Credit Facility, Initiation Date |  |  |  | Mar. 16, 2020 |
$2.0B revolving credit agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Feb. 11, 2020 |
Termination of Credit Agreement |  | 2,000 |  | $ 2,000 |
Borrowings [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,100 |  | $ 2,100 |
$2.20B Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Apr. 03, 2020 |
Termination of Credit Agreement |  | 2,200 |  | $ 2,200 |
4.0B Term Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Mar. 03, 2020 |
Termination of Credit Agreement |  | 4,000 |  | $ 4,000 |
2.15B Multicurrency Revolving Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Termination of Credit Agreement |  | 2,150 |  | 2,150 |
March 20, 2020 $500M Term Loan Credit Agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,000 |  | $ 1,000 |
Line of Credit Facility, Expiration Date |  |  |  | May 05, 2020 |
Line of Credit Facility, Initiation Date |  |  |  | Mar. 20, 2020 |
Termination of Credit Agreement |  | 500 |  | $ 500 |
March 23, 2020 $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 |
Termination of Credit Agreement |  | 500 |  | $ 500 |
1.0B Credit Agreement - Otis [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  | Feb. 10, 2020 |
Termination of Credit Agreement |  | 1,000 |  | $ 1,000 |
1.75B Credit Agreement - Carrier [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  | Feb. 10, 2020 |
Termination of Credit Agreement |  | 1,750 |  | $ 1,750 |
$2.0B May 6, 2020 revolving credit agreement [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,000 |  | $ 2,000 |
Line of Credit Facility, Expiration Date |  |  |  | May 05, 2021 |
Line of Credit Facility, Initiation Date |  |  |  | May 06, 2020 |

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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