Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Past Due Financing Receivable
Amortized cost	$ 10,827	$ 12,716
Client Financing Receivables
Past Due Financing Receivable
Amortized cost	9,643	10,863
Amortized Cost Not Accruing	103	110
Impaired financing receivables, related allowance	99	106
Client Financing Receivables | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	120	151
Amortized Cost > 90 Days and Accruing	20	43
Billed Invoices > 90 Days and Accruing	4	7
Client Financing Receivables | Americas
Past Due Financing Receivable
Amortized cost	5,731	6,488
Amortized Cost Not Accruing	66	71
Client Financing Receivables | Americas | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	80	111
Amortized Cost > 90 Days and Accruing	17	40
Billed Invoices > 90 Days and Accruing	1	6
Client Financing Receivables | Europe/Middle East/Africa
Past Due Financing Receivable
Amortized cost	2,531	3,007
Amortized Cost Not Accruing	30	31
Client Financing Receivables | Europe/Middle East/Africa | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	32	31
Amortized Cost > 90 Days and Accruing	3	1
Billed Invoices > 90 Days and Accruing	3	1
Client Financing Receivables | Asia Pacific
Past Due Financing Receivable
Amortized cost	1,381	1,368
Amortized Cost Not Accruing	7	8
Client Financing Receivables | Asia Pacific | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	8	9
Amortized Cost > 90 Days and Accruing	1	1
Billed Invoices > 90 Days and Accruing	$ 0	$ 0