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Acquisitions and Investments - Marine Investments (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended		16 Months Ended
	May 31, 2016 USD ($)	Mar. 31, 2017 Joint_venture vessel	Dec. 31, 2016 vessel	Dec. 31, 2015 vessel	Dec. 31, 2016 USD ($) vessel	May 01, 2016	Sep. 30, 2015
Crowley Coastal Partners
Schedule of Equity Method Investments [Line Items]
Cash paid to acquire equity method investments | $	$ 48				$ 189
Equity method investments, ownership percentage		50.00%
Crowley Ocean Partners
Schedule of Equity Method Investments [Line Items]
Cash paid to acquire equity method investments | $					$ 141
Equity method investments, ownership percentage		50.00%				50.00%	50.00%
Number of vessels | vessel			2	2	4
Crowley Blue Water Partners
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50.00%
Number of vessels | vessel		3
Crowley Maritime Corporation
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | Joint_venture		2
Crowley Maritime Corporation | Crowley Blue Water Partners
Schedule of Equity Method Investments [Line Items]
Percentage of partners interest contributed	100.00%

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Percentage of partner interests contributed

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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