Business and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($) contract	Dec. 31, 2023 USD ($)
Statement [Line Items]
Number of segments | segment	3
Charges associated with doubtful accounts	$ 45	$ 37	$ 43
Net aggregate financing receivables	211	141
Prepaid expenses	668	620
Income taxes receivable	989	853
Payments for purchases of investments	127	331	172
Investments in partnership	119	$ 174	71
Contracts terminated | contract		3
Contract termination cost		$ 56
Operating Expenses
Statement [Line Items]
U.S. government assistance, amount recognized	$ 50	43	51
Government Assistance, Income, Increase (Decrease), Statement of Income or Comprehensive Income [Extensible Enumeration]	Operating Income (Loss)
Capital Expenditures
Statement [Line Items]
U.S. government assistance, amount	$ 107	$ 198	$ 136
Government Assistance, Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, net