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Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | $ 63 | $ 161
Long-term debt (excluding capitalized leases) | 41,598 | 28,049
Portion at Other than Fair Value Measurement |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 74 | 169
Long-term debt (excluding capitalized leases) | 43,546 | 31,201
Level 1 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 0 | 0
Long-term debt (excluding capitalized leases) | 0 | 0
Level 2 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 63 | 161
Long-term debt (excluding capitalized leases) | 37,559 | 28,003
Level 3 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer Financing Notes Receivable | 0 | 0
Long-term debt (excluding capitalized leases) | $ 4,039 | $ 46

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of customer financing notes receivable. + References No definition available. + Details
Name: | rtx_CustomerFinancingNotesReceivableFairValueDisclosure
Namespace Prefix: | rtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term borrowings (excluding capitalized leases). + References No definition available. + Details
Name: | rtx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure
Namespace Prefix: | rtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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