Revenues and Contract Costs - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets
Prepaid expenses and other	$ 537	$ 621
Other assets	247	321
Total Contract Assets	784	942
Liabilities
Other current liabilities	7,534	7,492
Other liabilities	2,248	2,186
Total Contract Liabilities	$ 9,782	$ 9,678