Financing Receivables - By Portfolio Segment (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) class	Dec. 31, 2022 USD ($) class
Financing receivables
Amortized cost	$ 10,573	$ 13,769
Allowance for credit losses:
Allowance for credit losses, beginning balance	173
Allowance for credit losses, ending balance	$ 159	$ 173
Client Financing Receivables
Financing receivables
Number of classes of financing receivable | class	3	3
Amortized cost	$ 9,668	$ 12,531
Allowance for credit losses:
Allowance for credit losses, beginning balance	168	195
Write-offs	(9)	(25)
Recoveries	3	5
Additions/(releases)	(11)	(3)
Other	3	(4)
Allowance for credit losses, ending balance	154	168
Client Financing Receivables | Americas
Financing receivables
Amortized cost	5,841	7,281
Allowance for credit losses:
Allowance for credit losses, beginning balance	88	111
Write-offs	(9)	(20)
Recoveries	0	1
Additions/(releases)	6	(5)
Other	6	2
Allowance for credit losses, ending balance	92	88
Client Financing Receivables | Europe/Middle East/Africa
Financing receivables
Amortized cost	2,636	3,546
Allowance for credit losses:
Allowance for credit losses, beginning balance	60	61
Write-offs	0	(3)
Recoveries	0	0
Additions/(releases)	(14)	6
Other	(1)	(5)
Allowance for credit losses, ending balance	44	60
Client Financing Receivables | Asia Pacific
Financing receivables
Amortized cost	1,190	1,704
Allowance for credit losses:
Allowance for credit losses, beginning balance	20	23
Write-offs	0	(2)
Recoveries	3	4
Additions/(releases)	(4)	(4)
Other	(1)	(2)
Allowance for credit losses, ending balance	$ 18	$ 20