Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Other Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	$ 35,084	$ 34,278
Fair value	30,776	30,290
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	35,008	33,889
Fair value	30,700	29,901
Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	0	310
Fair value	0	310
Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	76	79
Fair value	$ 76	$ 79