Equity Method Investments - Summary of Income Statement Data for Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 102	$ 112
Total revenue	139	121
Costs and Expenses	75	76
Operating Income (Loss)	64	45
Net income	167	142
Mattox
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	15	0
Mattox | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	22
Costs and Expenses	3
Operating Income (Loss)	19
Net income	19
Amberjack
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	29	29
Amberjack | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	72	76
Costs and Expenses	17	19
Operating Income (Loss)	55	57
Net income	55	57
Mars
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	29	31
Mars | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	63	72
Costs and Expenses	22	28
Operating Income (Loss)	41	44
Net income	41	44
Bengal
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	3	5
Bengal | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	13	17
Costs and Expenses	7	7
Operating Income (Loss)	6	10
Net income	6	10
Explorer
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	7	14
Explorer | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	69	96
Costs and Expenses	42	47
Operating Income (Loss)	27	49
Net income	21	38
Colonial Pipeline Company (“Colonial”)
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	15	27
Colonial Pipeline Company (“Colonial”) | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	290	401
Costs and Expenses	133	163
Operating Income (Loss)	157	238
Net income	97	169
Poseidon | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	42	33
Costs and Expenses	10	9
Operating Income (Loss)	32	24
Net income	31	22
Other
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	4	6
Other | Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Total revenue	56	57
Costs and Expenses	32	27
Operating Income (Loss)	24	30
Net income	$ 23	$ 25