Related Parties (Details) - Changes in Balance Sheet - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Other current assets	$ 432		$ 251
Total Current Assets	6,271		5,658
Future income tax benefits	456		373
Total Assets	10,473		9,687
Total Current Liabilities	6,291		5,374
Future income tax obligations	448		695
Other long-term liabilities	629		311
Total Liabilities	13,856		7,361
Total Shareholders' (Deficit) Equity	(4,024)		1,700
Total (Deficit) Equity	(3,481)	$ (3,672)	2,231	$ 2,316	$ 2,324	$ 2,106
Total Liabilities and (Deficit) Equity	$ 10,473		9,687
Tax Matters Agreement | UTC
Related Party Transaction [Line Items]
Other current assets			167
Total Current Assets			167
Future income tax benefits			(4)
Total Assets			163
Accrued liabilities			110
Total Current Liabilities			110
Future income tax obligations			(377)
Other long-term liabilities			239
Total Liabilities			(28)
Total Shareholders' (Deficit) Equity			191
Total (Deficit) Equity			191
Total Liabilities and (Deficit) Equity			$ 163