Tax Matters - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Provision/(benefit) for taxes on income	$ (1,115)	$ 3,328	$ 1,852
Repatriation tax liability	15,000
Unremitted earnings of international subsidiaries	49,000
Unrecognized tax benefits excluding associated interest	3,100	2,900
Deferred tax assets associated with unrecognized tax benefits	1,700	1,500
Increase (decrease) of interest on income taxes expense	64	(17)	$ 108
Unrecognized tax benefits, interest on income taxes accrued	605	552
Unrecognized accrued interest decrease as a result of cash payments	11	31
Decrease in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	100
Noncurrent Deferred Tax Assets and Other Noncurrent Tax Assets [Member]
Income Tax Contingency [Line Items]
Deferred tax assets associated with unrecognized tax benefits	1,600	1,500
Other Taxes Payable [Member]
Income Tax Contingency [Line Items]
Deferred tax assets associated with unrecognized tax benefits	$ 45	$ 45