Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Cash distributions declared and paid	$ 4,400	$ 4,000	$ 3,100
Revenues earned for services provided to related parties	105	91	107
Costs and Expenses, Related Party	517	451	405
Equity Method Investments and Joint Ventures [Abstract]
Investments related to TTX	$ 930	891
TTX Company
Related Party Transaction [Line Items]
Ownership Percentage in TTX Company	17.40%
TTX Company
Related Party Transaction [Line Items]
Costs and Expenses, Related Party	$ 426	415	394
Parent Company
Related Party Transaction [Line Items]
Cash distributions declared and paid	4,400	4,000	3,100
Tax Refunds from Parent Company	50	128	65
Tax Payments to Parent Company	1,200	1,200	$ 1,200
Payable to parent company	$ 94	$ 86