Financing Receivables - By Portfolio Segment (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026 USD ($) class	Dec. 31, 2025 USD ($) class
Financing receivables
Amortized cost	$ 13,377	$ 16,324
Allowance for credit losses:
Allowance for credit losses, beginning balance	141
Allowance for credit losses, ending balance	$ 120	$ 141
Client Financing Receivables
Financing receivables
Number of classes of financing receivable | class	3	3
Amortized cost	$ 11,828	$ 13,328
Allowance for credit losses:
Allowance for credit losses, beginning balance	136	123
Write-offs	(10)	(22)
Recoveries	0	1
Additions/(releases)	(7)	22
Other	(1)	13
Allowance for credit losses, ending balance	119	136
Client Financing Receivables | Americas
Financing receivables
Amortized cost	6,674	7,278
Allowance for credit losses:
Allowance for credit losses, beginning balance	69	69
Write-offs	(7)	(16)
Recoveries	0	0
Additions/(releases)	3	10
Other	0	7
Allowance for credit losses, ending balance	66	69
Client Financing Receivables | Europe/Middle East/Africa
Financing receivables
Amortized cost	3,657	4,440
Allowance for credit losses:
Allowance for credit losses, beginning balance	60	45
Write-offs	0	(1)
Recoveries	0	0
Additions/(releases)	(9)	10
Other	(1)	6
Allowance for credit losses, ending balance	49	60
Client Financing Receivables | Asia Pacific
Financing receivables
Amortized cost	1,497	1,610
Allowance for credit losses:
Allowance for credit losses, beginning balance	7	9
Write-offs	(3)	(5)
Recoveries	0	0
Additions/(releases)	(1)	2
Other	0	0
Allowance for credit losses, ending balance	$ 4	$ 7