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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | $ 102,424 |  | $ 99,094 |  |  |  |  |
Cash | 1,088 | [1],[2] | 985 | [1],[3] | $ 870 | [4] | $ 1,775 | [4]
Insurance and reinsurance balances receivable | 9,551 |  | 8,970 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 14,799 |  | 13,577 |  |  |  |  |
Reinsurance recoverable on policy benefits | 193 |  | 182 |  |  |  |  |
Value of business acquired | 339 |  | 355 |  |  |  |  |
Goodwill and other intangible assets | 22,265 |  | 22,095 |  |  |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 16,919 |  | 14,528 |  |  |  |  |
Total assets | 167,578 |  | 159,786 |  |  |  |  |
Unpaid losses and loss expenses | 64,153 |  | 60,540 |  | 61,347 |  | 37,303 |
Unearned premiums | 15,456 |  | 14,779 |  |  |  |  |
Future policy benefits | 5,307 |  | 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 | 1,020 |  | 500 |  |  |  |  |
Long-term debt | 11,559 |  | 12,610 |  |  |  |  |
Trust preferred securities | 308 |  | 308 |  |  |  |  |
Other liabilities | 17,896 |  | 16,335 |  |  |  |  |
Total liabilities | 117,107 |  | 111,511 |  |  |  |  |
Total shareholders' equity | 50,471 |  | 48,275 |  | 48,372 |  |  |
Total liabilities and shareholders’ equity | 167,578 |  | 159,786 |  |  |  |  |
Chubb Limited (Parent Guarantor) |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 0 |  | 27 |  |  |  |  |
Cash | 1 | [1],[2] | 1 | [1],[3] | 6 | [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 | 40,936 |  | 38,408 |  |  |  |  |
Due from subsidiaries and affiliates, net | 9,913 |  | 10,482 |  |  |  |  |
Other assets | 61 |  | 3 |  |  |  |  |
Total assets | 50,911 |  | 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 | 85 | [2] | 363 | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |  |
Long-term debt | 0 |  | 0 |  |  |  |  |
Trust preferred securities | 0 |  | 0 |  |  |  |  |
Other liabilities | 355 |  | 283 |  |  |  |  |
Total liabilities | 440 |  | 646 |  |  |  |  |
Total shareholders' equity | 50,471 |  | 48,275 |  |  |  |  |
Total liabilities and shareholders’ equity | 50,911 |  | 48,921 |  |  |  |  |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 169 |  | 485 |  |  |  |  |
Cash | 0 | [1],[2] | 1 | [1],[3] | 2 | [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 | 50,926 |  | 49,509 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 276 |  | 436 |  |  |  |  |
Total assets | 51,371 |  | 50,431 |  |  |  |  |
Unpaid losses and loss expenses | 0 |  | 0 |  |  |  |  |
Unearned premiums | 0 |  | 0 |  |  |  |  |
Future policy benefits | 0 |  | 0 |  |  |  |  |
Due to subsidiaries and affiliates, net | 9,697 |  | 10,209 |  |  |  |  |
Affiliated notional cash pooling programs | 2 | [2] | 619 | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 1,020 |  | 500 |  |  |  |  |
Long-term debt | 11,548 |  | 12,599 |  |  |  |  |
Trust preferred securities | 308 |  | 308 |  |  |  |  |
Other liabilities | 1,685 |  | 1,582 |  |  |  |  |
Total liabilities | 24,260 |  | 25,817 |  |  |  |  |
Total shareholders' equity | 27,111 |  | 24,614 |  |  |  |  |
Total liabilities and shareholders’ equity | 51,371 |  | 50,431 |  |  |  |  |
Other Chubb Limited Subsidiaries |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 102,255 |  | 98,582 |  |  |  |  |
Cash | 1,174 | [1],[2] | 1,965 | [1],[3] | 2,158 | [4] | 2,743 | [4]
Insurance and reinsurance balances receivable | 11,076 |  | 10,498 |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | 27,007 |  | 24,496 |  |  |  |  |
Reinsurance recoverable on policy benefits | 1,232 |  | 1,153 |  |  |  |  |
Value of business acquired | 339 |  | 355 |  |  |  |  |
Goodwill and other intangible assets | 22,265 |  | 22,095 |  |  |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |  |  |
Due from subsidiaries and affiliates, net | 0 |  | 0 |  |  |  |  |
Other assets | 20,699 |  | 18,442 |  |  |  |  |
Total assets | 186,047 |  | 177,586 |  |  |  |  |
Unpaid losses and loss expenses | 75,688 |  | 70,683 |  |  |  |  |
Unearned premiums | 19,150 |  | 18,538 |  |  |  |  |
Future policy benefits | 6,346 |  | 6,007 |  |  |  |  |
Due to subsidiaries and affiliates, net | 216 |  | 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 | 18,477 |  | 17,368 |  |  |  |  |
Total liabilities | 121,296 |  | 114,283 |  |  |  |  |
Total shareholders' equity | 64,751 |  | 63,303 |  |  |  |  |
Total liabilities and shareholders’ equity | 186,047 |  | 177,586 |  |  |  |  |
Consolidating Adjustments and Eliminations |  |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Investments | 0 |  | 0 |  |  |  |  |
Cash | (87) | [1],[2] | (982) | [1],[3] | $ (1,296) | [4] | $ (971) | [4]
Insurance and reinsurance balances receivable | (1,525) |  | (1,528) |  |  |  |  |
Reinsurance recoverable on losses and loss expenses | (12,208) |  | (10,919) |  |  |  |  |
Reinsurance recoverable on policy benefits | (1,039) |  | (971) |  |  |  |  |
Value of business acquired | 0 |  | 0 |  |  |  |  |
Goodwill and other intangible assets | 0 |  | 0 |  |  |  |  |
Investments in subsidiaries | (91,862) |  | (87,917) |  |  |  |  |
Due from subsidiaries and affiliates, net | (9,913) |  | (10,482) |  |  |  |  |
Other assets | (4,117) |  | (4,353) |  |  |  |  |
Total assets | (120,751) |  | (117,152) |  |  |  |  |
Unpaid losses and loss expenses | (11,535) |  | (10,143) |  |  |  |  |
Unearned premiums | (3,694) |  | (3,759) |  |  |  |  |
Future policy benefits | (1,039) |  | (971) |  |  |  |  |
Due to subsidiaries and affiliates, net | (9,913) |  | (10,482) |  |  |  |  |
Affiliated notional cash pooling programs | (87) | [2] | (982) | [3] |  |  |  |
Repurchase agreements | 0 |  | 0 |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |  |
Long-term debt | 0 |  | 0 |  |  |  |  |
Trust preferred securities | 0 |  | 0 |  |  |  |  |
Other liabilities | (2,621) |  | (2,898) |  |  |  |  |
Total liabilities | (28,889) |  | (29,235) |  |  |  |  |
Total shareholders' equity | (91,862) |  | (87,917) |  |  |  |  |
Total liabilities and shareholders’ equity | $ (120,751) |  | $ (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 September 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 September 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 September 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 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 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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