Related Party Transactions - Accounts Payable Due to Related Party (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Related Party
Related Party Transaction [Line Items]
Due to related parties	$ 23	$ 16

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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+ Details