Other Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ 12	$ 26	$ 12
Equity income (loss) from investments in Trinidad	$ (2)		2
Net Foreign Currency Transaction Gains (Losses)		$ 2	(7)
Adjustment to Deferred Compensation Expense			$ 6