Income Taxes - Reconciliation of Income Tax Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross tax contingencies – beginning of period	$ 4,002	$ 3,242	$ 2,820
Gross increases to tax positions in prior periods	440	274	403
Gross decreases to tax positions in prior periods	(38)	(172)	(354)
Gross increases to current period tax positions	1,009	706	507
Settlements with tax authorities	(106)	(20)	(60)
Lapse of statute of limitations	(79)	(28)	(74)
Gross tax contingencies - end of period	5,228	$ 4,002	$ 3,242
Tax contingencies, that if fully recognized, would decrease our effective tax rate	$ 3,300