Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Past Due Financing Receivable
Amortized cost	$ 12,289	$ 12,639
Client Financing Receivables
Past Due Financing Receivable
Amortized cost	11,065	10,418
Amortized Cost Not Accruing	86	97
Impaired financing receivables, related allowance	84	94
Client Financing Receivables | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	93	103
Amortized Cost > 90 Days and Accruing	9	8
Billed Invoices > 90 Days and Accruing	2	1
Client Financing Receivables | Americas
Past Due Financing Receivable
Amortized cost	6,306	5,861
Amortized Cost Not Accruing	51	62
Client Financing Receivables | Americas | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	57	66
Amortized Cost > 90 Days and Accruing	6	7
Billed Invoices > 90 Days and Accruing	1	1
Client Financing Receivables | Europe/Middle East/Africa
Past Due Financing Receivable
Amortized cost	3,347	3,128
Amortized Cost Not Accruing	32	28
Client Financing Receivables | Europe/Middle East/Africa | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	33	29
Amortized Cost > 90 Days and Accruing	1	1
Billed Invoices > 90 Days and Accruing	0	0
Client Financing Receivables | Asia Pacific
Past Due Financing Receivable
Amortized cost	1,412	1,429
Amortized Cost Not Accruing	3	7
Client Financing Receivables | Asia Pacific | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	3	8
Amortized Cost > 90 Days and Accruing	1	0
Billed Invoices > 90 Days and Accruing	$ 0	$ 0