Fixed Assets - Components of Fixed Assets (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Furniture, equipment and software [Member]
Property,Plant and Equipment [LineItems]
Cost	$ 17	$ 12
Leasehold Improvements [Member]
Property,Plant and Equipment [LineItems]
Cost	$ 4	$ 18

The carrying amount on the books of the entity of the impaired asset to be disposed of by a method other than sale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-2

Name:	us-gaap_ImpairedAssetsToBeDisposedOfByMethodOtherThanSaleCarryingValueOfAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant