Segments - Other Reportable Segment Items (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) segment	Sep. 30, 2025 USD ($) segment
Segment Information
Interest Expense	$ 491	$ 492	$ 1,451	$ 1,457
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	442	451	$ 1,300	$ 1,293
Interest Income	187	190	575	528
Interest Expense	104	95	320	268
Operating Segments | Software
Segment Information
Depreciation/amortization of non-acquired intangibles	149	133	420	388
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Consulting
Segment Information
Depreciation/amortization of non-acquired intangibles	16	20	46	61
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Infrastructure
Segment Information
Depreciation/amortization of non-acquired intangibles	276	296	832	841
Interest Income	0	0	0	0
Interest Expense	0	0	0	0
Operating Segments | Financing
Segment Information
Depreciation/amortization of non-acquired intangibles	1	1	2	3
Interest Income	187	190	575	528
Interest Expense	$ 104	$ 95	$ 320	$ 268