Supplemental Financial Information - Post-employment Obligations and Other Long-term Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Post-employment Obligations and Other Long-term Liabilities [Line Items]
Defined benefit pension plans and post-employment medical and dental plans for significant plans	$ 1,964	$ 1,784
Deferred income taxes	568	991
Operating lease liabilities	949	943
All other	3,466	3,804
Total	6,947	7,522
Net unrecognized tax benefits	3,323	2,036	$ 1,908
Transition tax obligation	598
Post-employment obligations and other long-term liabilities
Post-employment Obligations and Other Long-term Liabilities [Line Items]
Net unrecognized tax benefits	650	850
Transition tax obligation	$ 430	$ 740