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Related Party Transactions Related Party Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Accounts payable to related companies	$ 23		$ 27
Accounts receivable from related companies	90		79
Revenue from Related Parties	130	$ 133
FGT [Member]
Related Party Transaction [Line Items]
Accounts receivable from related companies	14		12
Phillips 66 Company [Member]
Related Party Transaction [Line Items]
Accounts receivable from related companies	21		30
Other Related Parties [Member]
Related Party Transaction [Line Items]
Accounts receivable from related companies	$ 55		$ 37

X

- Definition

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

+ References

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- Definition

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).

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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