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Subsequent Events (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jul. 17, 2018
Jul. 02, 2018
Subsequent Event [Line Items]              
Net sales $ 4,456 $ 4,039 $ 12,520 $ 10,829      
Aventics [Member]              
Subsequent Event [Line Items]              
Net sales         $ 425    
Aventics [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Cash paid, net of cash acquired           $ 622  
Textron's Tools & Test [Member]              
Subsequent Event [Line Items]              
Net sales         $ 470    
Textron's Tools & Test [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Cash paid, net of cash acquired             $ 807