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Related Party Transactions - Purchases from Related Parties (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Purchases from related parties	$ 122	$ 107
Crowley Blue Water Partners
Related Party Transaction [Line Items]
Purchases from related parties	14	0
Crowley Ocean Partners
Related Party Transaction [Line Items]
Purchases from related parties	19	6
Explorer
Related Party Transaction [Line Items]
Purchases from related parties	0	2
Illinois Extension Pipeline
Related Party Transaction [Line Items]
Purchases from related parties	25	27
LOCAP
Related Party Transaction [Line Items]
Purchases from related parties	5	6
LOOP
Related Party Transaction [Line Items]
Purchases from related parties	13	13
TAAE
Related Party Transaction [Line Items]
Purchases from related parties	8	9
TACE
Related Party Transaction [Line Items]
Purchases from related parties	16	17
TAME
Related Party Transaction [Line Items]
Purchases from related parties	17	20
Other equity method investees
Related Party Transaction [Line Items]
Purchases from related parties	$ 5	$ 7

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