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

Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - Parent Company - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]
Due from Affiliate, Current	$ 60	$ 35		$ 150	$ 195
Interest Income [Member]
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]
Revenue from Related Parties	$ 2	$ 1	$ 2