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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+ Details

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 1	$ 1		$ 1	$ 1
Accounts Receivable, Related Parties	$ 1			$ 1		$ 1
Loan receivable from parent			$ 10			$ 4
Settlement of affiliate loan		10	$ 10		10
Additional Paid-in Capital [Member]
Related Party Transaction [Line Items]
Settlement of affiliate loan		$ 0			$ 0