Other Financial Information - Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 319	$ 295
Income tax receivable	0	22
Materials, supplies and inventory	236	96
Contract assets	20	45
Note receivable	0	56
Receivable for sale of land	0	56
Other	5	11
Total other current assets	803	829
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Prepaid Expenses and Other Current Assets [Abstract]
Other current assets reclassified as held for sale	59
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business and ILEC Business
Prepaid Expenses and Other Current Assets [Abstract]
Other current assets reclassified as held for sale		126
Acquisition Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	123	142
Fulfillment Costs
Prepaid Expenses and Other Current Assets [Abstract]
Contract costs	$ 100	$ 106