Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Capitalized Contract Cost [Line Items]
Customer receivables	$ 1,424	$ 1,493
Contract assets	34	73
Contract liabilities	656	680
Accounts receivable, gross	1,500	1,600
Allowance for doubtful accounts receivable	73	102
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost [Line Items]
Customer receivables	76
Contract assets	16
Contract liabilities	$ 59
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business and ILEC Business
Capitalized Contract Cost [Line Items]
Customer receivables		288
Contract assets		9
Contract liabilities		$ 161