Financial Instruments (Interest Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest	$ 224	$ 231	$ 223
Capitalized interest expense	$ 20	$ 17	$ 13