Segment and Geographic Area Information - Reconciliation of Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total Assets	$ 73,214	$ 74,438
Operating Segments
Segment Reporting Information [Line Items]
Total Assets	24,184	22,337	$ 21,174
Segment Reconciling Items
Segment Reporting Information [Line Items]
Cash and investments	8,078	10,936
Goodwill and intangible assets	32,494	33,253
All other	8,458	7,912
Segment Reconciling Items | Defined Benefit Plans
Segment Reporting Information [Line Items]
All other	$ 4,160	$ 3,200