Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Cash distributions declared and paid	$ 5,000	$ 3,800	$ 4,830
Revenues earned for services provided to related parties	104	106	119
Expenditures to related parties	421	385	367
Equity Method Investments and Joint Ventures [Abstract]
Investments related to TTX	$ 807	749
TTX Company
Related Party Transaction [Line Items]
Ownership Percentage in TTX Company	17.40%
TTX Company
Related Party Transaction [Line Items]
Expenditures to related parties	$ 409	386
Parent Company
Related Party Transaction [Line Items]
Cash distributions declared and paid	5,000	3,800	4,800
Tax Refunds from Parent Company	20	47	55
Tax payments to parent company	1,500	1,100	$ 1,100
Payable to parent company	$ 112	$ 124