Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 2,467	$ 948
Net discrete tax benefit	558	(48)
Cash paid for income taxes, net of refunds	458	$ 619	$ 11,018	$ 6,201
Tax contingencies	$ 5,500		$ 5,500		$ 5,200