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 |