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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | $ 100,208 |  | $ 99,094 |  |  |  |  |
Cash | 1,297 | [1],[2] | 985 | [1],[3] | $ 1,011 | [4] | $ 1,775 | [4]
Insurance and reinsurance balances receivable | 9,662 |  | 8,970 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 13,358 |  | 13,577 |  |  |  |  |
Reinsurance recoverable on policy benefits | 198 |  | 182 |  |  |  |  |
Value of business acquired | 337 |  | 355 |  |  |  |  |
Goodwill and other intangible assets | 22,013 |  | 22,095 |  |  |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 15,915 |  | 14,528 |  |  |  |  |
Total assets | 162,988 |  | 159,786 |  |  |  |  |
Unpaid losses and loss expenses | 60,394 |  | 60,540 |  | 60,819 |  | 37,303 |
Unearned premiums | 15,289 |  | 14,779 |  |  |  |  |
Future policy benefits | 5,190 |  | 5,036 |  |  |  |  |
Due to subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Affiliated notional cash pooling programs | 0 |  | 0 |  |  |  |  |
Repurchase agreements | 1,408 |  | 1,403 |  |  |  |  |
Short-term debt | 922 |  | 500 |  |  |  |  |
Long-term debt | 11,667 |  | 12,610 |  |  |  |  |
Trust preferred securities | 308 |  | 308 |  |  |  |  |
Other liabilities | 17,461 |  | 16,335 |  |  |  |  |
Total liabilities | 112,639 |  | 111,511 |  |  |  |  |
Total shareholders' equity | 50,349 |  | 48,275 |  | 47,226 |  |  |
Total liabilities and shareholders’ equity | 162,988 |  | 159,786 |  |  |  |  |
Chubb Limited (Parent Guarantor) |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 23 |  | 27 |  |  |  |  |
Cash | 0 | [1],[2] | 1 | [1],[3] | 1 | [4] | 1 | [4]
Insurance and reinsurance balances receivable | 0 |  | 0 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 0 |  | 0 |  |  |  |  |
Reinsurance recoverable on policy benefits | 0 |  | 0 |  |  |  |  |
Value of business acquired | 0 |  | 0 |  |  |  |  |
Goodwill and other intangible assets | 0 |  | 0 |  |  |  |  |
Investments in subsidiaries | 40,553 |  | 38,408 |  |  |  |  |
Due from subsidiaries and affiliates, net | 10,251 |  | 10,482 |  |  |  |  |
Other assets | 141 |  | 3 |  |  |  |  |
Total assets | 50,968 |  | 48,921 |  |  |  |  |
Unpaid losses and loss expenses | 0 |  | 0 |  |  |  |  |
Unearned premiums | 0 |  | 0 |  |  |  |  |
Future policy benefits | 0 |  | 0 |  |  |  |  |
Due to subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Affiliated notional cash pooling programs | 193 | [2] | 363 | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |  |
Long-term debt | 0 |  | 0 |  |  |  |  |
Trust preferred securities | 0 |  | 0 |  |  |  |  |
Other liabilities | 426 |  | 283 |  |  |  |  |
Total liabilities | 619 |  | 646 |  |  |  |  |
Total shareholders' equity | 50,349 |  | 48,275 |  |  |  |  |
Total liabilities and shareholders’ equity | 50,968 |  | 48,921 |  |  |  |  |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 305 |  | 485 |  |  |  |  |
Cash | 167 | [1],[2] | 1 | [1],[3] | 207 | [4] | 2 | [4]
Insurance and reinsurance balances receivable | 0 |  | 0 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 0 |  | 0 |  |  |  |  |
Reinsurance recoverable on policy benefits | 0 |  | 0 |  |  |  |  |
Value of business acquired | 0 |  | 0 |  |  |  |  |
Goodwill and other intangible assets | 0 |  | 0 |  |  |  |  |
Investments in subsidiaries | 49,982 |  | 49,509 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 289 |  | 436 |  |  |  |  |
Total assets | 50,743 |  | 50,431 |  |  |  |  |
Unpaid losses and loss expenses | 0 |  | 0 |  |  |  |  |
Unearned premiums | 0 |  | 0 |  |  |  |  |
Future policy benefits | 0 |  | 0 |  |  |  |  |
Due to subsidiaries and affiliates, net | 9,939 |  | 10,209 |  |  |  |  |
Affiliated notional cash pooling programs | 0 | [2] | 619 | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 922 |  | 500 |  |  |  |  |
Long-term debt | 11,656 |  | 12,599 |  |  |  |  |
Trust preferred securities | 308 |  | 308 |  |  |  |  |
Other liabilities | 1,582 |  | 1,582 |  |  |  |  |
Total liabilities | 24,407 |  | 25,817 |  |  |  |  |
Total shareholders' equity | 26,336 |  | 24,614 |  |  |  |  |
Total liabilities and shareholders’ equity | 50,743 |  | 50,431 |  |  |  |  |
Other Chubb Limited Subsidiaries |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 99,880 |  | 98,582 |  |  |  |  |
Cash | 1,323 | [1],[2] | 1,965 | [1],[3] | 1,825 | [4] | 2,743 | [4]
Insurance and reinsurance balances receivable | 11,699 |  | 10,498 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 24,118 |  | 24,496 |  |  |  |  |
Reinsurance recoverable on policy benefits | 1,205 |  | 1,153 |  |  |  |  |
Value of business acquired | 337 |  | 355 |  |  |  |  |
Goodwill and other intangible assets | 22,013 |  | 22,095 |  |  |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 19,527 |  | 18,442 |  |  |  |  |
Total assets | 180,102 |  | 177,586 |  |  |  |  |
Unpaid losses and loss expenses | 70,460 |  | 70,683 |  |  |  |  |
Unearned premiums | 18,876 |  | 18,538 |  |  |  |  |
Future policy benefits | 6,197 |  | 6,007 |  |  |  |  |
Due to subsidiaries and affiliates, net | 312 |  | 273 |  |  |  |  |
Affiliated notional cash pooling programs | 0 | [2] | 0 | [3] |  |  |  |
Repurchase agreements | 1,408 |  | 1,403 |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |  |
Long-term debt | 11 |  | 11 |  |  |  |  |
Trust preferred securities | 0 |  | 0 |  |  |  |  |
Other liabilities | 18,639 |  | 17,368 |  |  |  |  |
Total liabilities | 115,903 |  | 114,283 |  |  |  |  |
Total shareholders' equity | 64,199 |  | 63,303 |  |  |  |  |
Total liabilities and shareholders’ equity | 180,102 |  | 177,586 |  |  |  |  |
Consolidating Adjustments and Eliminations |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 0 |  | 0 |  |  |  |  |
Cash | (193) | [1],[2] | (982) | [1],[3] | $ (1,022) | [4] | $ (971) | [4]
Insurance and reinsurance balances receivable | (2,037) |  | (1,528) |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | (10,760) |  | (10,919) |  |  |  |  |
Reinsurance recoverable on policy benefits | (1,007) |  | (971) |  |  |  |  |
Value of business acquired | 0 |  | 0 |  |  |  |  |
Goodwill and other intangible assets | 0 |  | 0 |  |  |  |  |
Investments in subsidiaries | (90,535) |  | (87,917) |  |  |  |  |
Due from subsidiaries and affiliates, net | (10,251) |  | (10,482) |  |  |  |  |
Other assets | (4,042) |  | (4,353) |  |  |  |  |
Total assets | (118,825) |  | (117,152) |  |  |  |  |
Unpaid losses and loss expenses | (10,066) |  | (10,143) |  |  |  |  |
Unearned premiums | (3,587) |  | (3,759) |  |  |  |  |
Future policy benefits | (1,007) |  | (971) |  |  |  |  |
Due to subsidiaries and affiliates, net | (10,251) |  | (10,482) |  |  |  |  |
Affiliated notional cash pooling programs | (193) | [2] | (982) | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |  |
Long-term debt | 0 |  | 0 |  |  |  |  |
Trust preferred securities | 0 |  | 0 |  |  |  |  |
Other liabilities | (3,186) |  | (2,898) |  |  |  |  |
Total liabilities | (28,290) |  | (29,235) |  |  |  |  |
Total shareholders' equity | (90,535) |  | (87,917) |  |  |  |  |
Total liabilities and shareholders’ equity | $ (118,825) |  | $ (117,152) |  |  |  |  |
[1] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[2] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[4] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At June 30, 2016 and December 31, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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- Definition Carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also serves as the sum of assets not individually reported in the financial statements, or not separately disclosed in notes. This balance differs from the balance sheet in that it includes securities lending collateral, accrued investment income, prepaid reinsurance premiums, deferred tax assets, and investments in partially-owned insurance companies as well as the other asset balance. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: 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 2: 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 The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount of accrued obligation to policyholders that relates to insured events for long-duration contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 25 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28366191&loc=d3e13145-158430 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 + Details
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- Definition The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts. + References Reference 1: 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.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 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 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing -URI http://asc.fasb.org/extlink&oid=49203159 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + 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(19)(a)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + 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(30)) -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 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date. + References Reference 1: 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(a)(13)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column D)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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