Segments - Other Reportable Segment Items (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment Information
Interest Expense	$ 473	$ 455
Number of business segments to which assets are assigned when ownership is shared between several segments | segment	1
Operating Segments
Segment Information
Depreciation/amortization of non-acquired intangibles	$ 433	409
Interest Income	205	176
Interest Expense	111	90
Operating Segments | Software
Segment Information
Depreciation/amortization of non-acquired intangibles	134	121
Interest Income	0	0
Interest Expense	0	0
Operating Segments | Consulting
Segment Information
Depreciation/amortization of non-acquired intangibles	21	21
Interest Income	0	0
Interest Expense	0	0
Operating Segments | Infrastructure
Segment Information
Depreciation/amortization of non-acquired intangibles	278	266
Interest Income	0	0
Interest Expense	0	0
Operating Segments | Financing
Segment Information
Depreciation/amortization of non-acquired intangibles	1	1
Interest Income	205	176
Interest Expense	$ 111	$ 90