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Accounting Policies and Supplemental Disclosures - Acquisition Activity (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounting Policies [Abstract]
Cash consideration	$ 3,354	$ 3,513	$ 5,680	$ 5,488
Goodwill	$ 22,770		$ 22,770		$ 22,789

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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