Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Past Due Financing Receivable
Amortized cost	$ 10,573	$ 13,769
Client Financing Receivables
Past Due Financing Receivable
Amortized cost	9,668	12,531
Amortized Cost Not Accruing	115	137
Impaired financing receivables, related allowance	112	122
Client Financing Receivables | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	152	344
Amortized Cost > 90 Days and Accruing	37	208
Billed Invoices > 90 Days and Accruing	9	23
Client Financing Receivables | Americas
Past Due Financing Receivable
Amortized cost	5,841	7,281
Amortized Cost Not Accruing	70	74
Client Financing Receivables | Americas | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	101	272
Amortized Cost > 90 Days and Accruing	33	198
Billed Invoices > 90 Days and Accruing	7	22
Client Financing Receivables | Europe/Middle East/Africa
Past Due Financing Receivable
Amortized cost	2,636	3,546
Amortized Cost Not Accruing	30	46
Client Financing Receivables | Europe/Middle East/Africa | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	34	52
Amortized Cost > 90 Days and Accruing	4	8
Billed Invoices > 90 Days and Accruing	1	1
Client Financing Receivables | Asia Pacific
Past Due Financing Receivable
Amortized cost	1,190	1,704
Amortized Cost Not Accruing	15	17
Client Financing Receivables | Asia Pacific | Financial Asset, Equal to or Greater than 90 Days Past Due
Past Due Financing Receivable
Amortized cost	17	20
Amortized Cost > 90 Days and Accruing	1	3
Billed Invoices > 90 Days and Accruing	$ 1	$ 1