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Accounts Receivable, Net (Details) - USD ($) $ in Billions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Receivables [Abstract] |  |
Factored receivables | $ 4.4 | $ 5.4

X
- Definition Factored receivables + References No definition available. + Details
Name: | rtx_FactoredReceivables
Namespace Prefix: | rtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration