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Basis of Presentation - Additional Information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsidiary or Equity Method Investee [Line Items]
Shares excluded from diluted EPS calculation	0.4	3.3	0.4	4.7
CNA Financial [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary ownership percentage			89.00%
Diamond Offshore Drilling, Inc. [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary ownership percentage			53.00%
Boardwalk Pipeline Partners, LP [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary ownership percentage			51.00%
Consolidated Container Company [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary ownership percentage			99.00%

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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X

- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

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X

- Details

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