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Related Parties - Schedule of Shared Allocated Costs Before Separation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allocated Centralized Costs | UTC      
Related Party Transaction [Line Items]      
Allocated centralized costs $ 16 $ 80 $ 90