Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Cash distributions declared and paid	$ 3,800	$ 4,830	$ 4,425
Revenues earned for services provided to related parties	106	119	158
Expenditures to related parties	$ 385	367	386
Equity Method Investments and Joint Ventures [Abstract]
Ownership Percentage in TTX Company	17.30%
Investments related to TTX	$ 749	703
Parent Company
Related Party Transaction [Line Items]
Cash distributions declared and paid	3,800	4,800	4,400
Tax Refunds from Parent Company	47	55	1
Tax payments to parent company	1,100	1,100	$ 934
Payable to parent company	$ 124	$ 70