Credit Losses on Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 85	$ 114	$ 191
Provision for expected losses	100	133	105
Write-offs charged against the allowance	(127)	(175)	(177)
Recoveries collected	9	16	19
Classified/ Change in allowance in assets held for sale		(3)	(24)
Ending balance	67	85	114
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses		5
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57	88	109
Provision for expected losses	35	25	50
Write-offs charged against the allowance	(62)	(61)	(76)
Recoveries collected	6	10	13
Classified/ Change in allowance in assets held for sale		(5)	(8)
Ending balance	36	57	88
Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28	26	82
Provision for expected losses	65	108	55
Write-offs charged against the allowance	(65)	(114)	(101)
Recoveries collected	3	6	6
Classified/ Change in allowance in assets held for sale		2	(16)
Ending balance	$ 31	$ 28	$ 26