Credit Losses on Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 67	$ 85	$ 114
Provision for expected losses	72	100	133
Write-offs charged against the allowance	(90)	(127)	(175)
Recoveries collected	10	9	16
Change in allowance in assets held for sale			(3)
Ending balance	59	67	85
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses			5
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36	57	88
Provision for expected losses	26	35	25
Write-offs charged against the allowance	(32)	(62)	(61)
Recoveries collected	6	6	10
Change in allowance in assets held for sale			(5)
Ending balance	36	36	57
Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31	28	26
Provision for expected losses	46	65	108
Write-offs charged against the allowance	(58)	(65)	(114)
Recoveries collected	4	3	6
Change in allowance in assets held for sale			2
Ending balance	$ 23	$ 31	$ 28