Investment in Unconsolidated Entities - Schedule of Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity method investments	$ 475		$ 456
Measurement alternative method investments	22		21
Total investments in unconsolidated entities	497	$ 509	$ 477
Schedule of Equity Method Investments [Line Items]
Revenues	1,318	1,261
Operating expenses	1,208	1,189
Operating income	110	72
Other income (expense), net		0
Net income	71	83
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Revenues	1,733	1,662
Operating expenses	1,280	1,166
Operating income	453	496
Other income (expense), net	12	3
Net income	$ 465	$ 499