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Debt - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2019 | Mar. 31, 2019 | Jun. 30, 2019
CNA Financial [Member] | Three Point Nine Percentage Notes Due Two Thousand Twenty Nine [Member] |  |  |
Aggregate principal amount | $ 500 |  |
Percentage of senior notes | 3.90% |  |
Senior notes due date | May 01, 2029 |  |
Debt Instrument, Maturity Date | May 01, 2029 |  |
CNA Financial [Member] | Five Point Nine Percentage Notes Due Two Zero Two Zero [Member] |  |  |
Percentage of senior notes | 5.90% |  |
Senior notes due date | Aug. 15, 2020 |  |
Aggregate outstanding principal amount | $ 500 |  |
Gain (Loss) on Extinguishment of Debt |  | $ (21) |
Extinguishment of Debt, Gain (Loss), Net of Tax |  | $ (15) |
Debt Instrument, Maturity Date | Aug. 15, 2020 |  |
Boardwalk Pipeline [Member] | Five Point Eight Percentage Notes Due Two Zero One Nine [Member] |  |  |
Percentage of senior notes | 5.80% |  |
Aggregate outstanding principal amount | $ 350 |  |
Senior notes due year | 2019 |  |
Boardwalk Pipeline [Member] | Four Point Eight Percentage Due Two Thousand Twenty Nine [Member] |  |  |
Aggregate principal amount | $ 500 |  |
Percentage of senior notes | 4.80% |  |
Senior notes due date | May 03, 2029 |  |
Debt Instrument, Maturity Date | May 03, 2029 |  |
Consolidated Container [Member] | Term Loan [Member] |  |  |
Senior notes due date |  |  | Jun. 14, 2026
Credit agreement term loan |  |  | $ 250
Debt Instrument, Description of Variable Rate Basis |  |  | London Interbank Offered Rate (“LIBOR”) plus an applicable margin of 3.5%
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.50%
Debt Instrument, Maturity Date |  |  | Jun. 14, 2026

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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/disclosureRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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