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Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017
CNA Financial [Member] | 3.5% Senior Notes Due August 15, 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount | $ 500,000,000 |  |  | $ 500,000,000
Debt instrument interest rate | 3.50% |  |  | 3.50%
Debt maturity date | Aug. 15, 2027 |  |  |
CNA Financial [Member] | 7.4% Senior Notes Due November 15, 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount | $ 350,000,000 |  |  | $ 350,000,000
Debt instrument interest rate | 7.40% |  |  | 7.40%
Debt maturity date | Nov. 15, 2019 |  |  |
Early extinguishment of debt, loss | $ 42,000,000 |  |  | $ 42,000,000
Early extinguishment of debt, loss net of tax and noncontrolling interests | 24,000,000 |  |  | 24,000,000
CNA Financial [Member] | 7.4% Senior Notes Due November 15, 2019 [Member] | Interest Expense [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Early extinguishment of debt | 350,000,000 |  |  | 350,000,000
Diamond Offshore [Member] | 7.9% Senior Notes Due August 15, 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount | $ 500,000,000 |  |  | $ 500,000,000
Debt instrument interest rate | 7.90% |  |  | 7.90%
Debt maturity date | Aug. 15, 2025 |  |  |
Diamond Offshore [Member] | 5.9% Senior Notes Due May 1, 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount | $ 500,000,000 |  |  | $ 500,000,000
Debt instrument interest rate | 5.90% |  |  | 5.90%
Debt maturity date | May 01, 2019 |  |  |
Early extinguishment of debt, loss | $ 35,000,000 |  |  | $ 35,000,000
Early extinguishment of debt, loss net of tax and noncontrolling interests | 11,000,000 |  |  | 11,000,000
Diamond Offshore [Member] | 5.9% Senior Notes Due May 1, 2019 [Member] | Interest Expense [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Early extinguishment of debt | 500,000,000 |  |  | 500,000,000
Boardwalk Pipeline [Member] | 4.5% Senior Notes Due July 15, 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount |  |  | $ 500,000,000 |
Debt instrument interest rate |  |  | 4.50% |
Debt maturity date |  |  | Jul. 15, 2027 |
Boardwalk Pipeline [Member] | 6.3% Senior Notes Due August 15, 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount |  |  | $ 275,000,000 |
Debt instrument interest rate |  |  | 6.30% |
Debt maturity date |  |  | Aug. 15, 2017 |
Consolidated Container Company [Member] | Interest Rate Swaps [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate swaps for notional amount |  | $ 500,000,000 |  |
Percentage of interest on hedged portion of term loan |  | 5.60% |  |
Consolidated Container Company [Member] | Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | $ 19,000,000 |  |
Consolidated Container Company [Member] | Credit Agreement [Member] | Loans Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument principal amount |  | $ 605,000,000 |  |
Debt maturity date |  | May 22, 2024 |  |
Annual principal amortization of loan |  | 1.00% |  |
Consolidated Container Company [Member] | Credit Agreement [Member] | Loans Payable [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument LIBOR applicable margin |  | 3.50% |  |
Consolidated Container Company [Member] | Credit Agreement [Member] | Loans Payable [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate |  | 1.00% |  |
Consolidated Container Company [Member] | Credit Agreement [Member] | ABL Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit agreement period |  | 5 years |  |
Line of credit borrowing amount |  | $ 125,000,000 |  |
Borrowings outstanding amount | $ 0 |  |  | $ 0

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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