Segments - Other Reportable Segment Items (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($) segment
Segment Information
Interest Expense	$ 486	$ 510	$ 959	$ 965
Number of business segments to which assets are assigned when ownership is shared between several segments | segment			1	1
Operating Segments
Segment Information
Depreciation/amortization of non-acquired intangibles	425	433	$ 858	$ 842
Interest Income	183	162	388	338
Interest Expense	105	84	216	173
Operating Segments | Software
Segment Information
Depreciation/amortization of non-acquired intangibles	137	134	271	255
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Consulting
Segment Information
Depreciation/amortization of non-acquired intangibles	9	20	30	40
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Infrastructure
Segment Information
Depreciation/amortization of non-acquired intangibles	279	278	556	544
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Financing
Segment Information
Depreciation/amortization of non-acquired intangibles	1	0	1	2
Interest Income	183	162	388	338
Interest Expense	$ 105	$ 84	$ 216	$ 173