Credit Losses on Financial Instruments - Finance Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss
Beginning balance	$ 29	$ 34	$ 36
Provision for expected losses	39	45	66
Write-offs charged against the allowance	(32)	(52)	(69)
Recoveries collected	2	2	1
Change in allowance in assets held for sale	(1)
Ending balance	37	29	34
Business
Financing Receivable, Allowance for Credit Loss
Beginning balance	13	14	20
Provision for expected losses	9	9	20
Write-offs charged against the allowance	(11)	(10)	(26)
Recoveries collected	0	0	0
Change in allowance in assets held for sale	0
Ending balance	11	13	14
Mass Markets
Financing Receivable, Allowance for Credit Loss
Beginning balance	16	20	16
Provision for expected losses	30	36	46
Write-offs charged against the allowance	(21)	(42)	(43)
Recoveries collected	2	2	1
Change in allowance in assets held for sale	(1)
Ending balance	$ 26	$ 16	$ 20