Revenue and Contract Costs - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets
Prepaid expenses and other	$ 621	$ 546
Other assets	321	268
Total Contract Assets	942	814
Liabilities
Other current liabilities	7,492	6,955
Other liabilities	2,186	1,947
Total Contract Liabilities	$ 9,678	$ 8,902