Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expense related to valuation of inventory	$ 20
Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 49	$ 71
Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash		$ 13