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Goodwill, Customer Relationships and Other Intangible Assets - Reconciliation of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Goodwill
As of December 31, 2022					$ 1,970
Impairment	$ 0	$ (2,000)		$ 0	(1,970)	$ 0
As of September 30, 2023	0		$ 1,970		0
Accumulated impairment losses	$ 10,200		$ 8,200		$ 10,200

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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