Other Financial Information - Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 372	$ 395
Income tax receivable	483	273
Materials, supplies and inventory	146	209
Contract assets	16	19
Assets held for sale	24	104
Other	22	14
Total other current assets	1,274	1,223
Acquisition Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	102	107
Fulfillment Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	$ 109	$ 102