Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Past Due Financing Receivable
Amortized cost	$ 10,593	$ 12,716
Client Financing Receivables
Past Due Financing Receivable
Amortized cost	9,508	10,863
Amortized Cost Not Accruing	109	110
Impaired financing receivables, related allowance	105	106
Client Financing Receivables | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	152	151
Amortized Cost > 90 Days and Accruing	45	43
Billed Invoices > 90 Days and Accruing	8	7
Client Financing Receivables | Americas
Past Due Financing Receivable
Amortized cost	5,722	6,488
Amortized Cost Not Accruing	71	71
Client Financing Receivables | Americas | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	102	111
Amortized Cost > 90 Days and Accruing	33	40
Billed Invoices > 90 Days and Accruing	3	6
Client Financing Receivables | Europe/Middle East/Africa
Past Due Financing Receivable
Amortized cost	2,511	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	41	31
Amortized Cost > 90 Days and Accruing	12	1
Billed Invoices > 90 Days and Accruing	4	1
Client Financing Receivables | Asia Pacific
Past Due Financing Receivable
Amortized cost	1,275	1,368
Amortized Cost Not Accruing	8	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