Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Past Due Financing Receivable
Amortized cost	$ 11,419	$ 12,716
Client Financing Receivables
Past Due Financing Receivable
Amortized cost	10,077	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	123	151
Amortized Cost > 90 Days and Accruing	21	43
Billed Invoices > 90 Days and Accruing	5	7
Client Financing Receivables | Americas
Past Due Financing Receivable
Amortized cost	6,075	6,488
Amortized Cost Not Accruing	67	71
Client Financing Receivables | Americas | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	83	111
Amortized Cost > 90 Days and Accruing	17	40
Billed Invoices > 90 Days and Accruing	2	6
Client Financing Receivables | Europe/Middle East/Africa
Past Due Financing Receivable
Amortized cost	2,672	3,007
Amortized Cost Not Accruing	29	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	33	31
Amortized Cost > 90 Days and Accruing	4	1
Billed Invoices > 90 Days and Accruing	3	1
Client Financing Receivables | Asia Pacific
Past Due Financing Receivable
Amortized cost	1,330	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	0	1
Billed Invoices > 90 Days and Accruing	$ 0	$ 0