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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | $ 101,163 |  | $ 102,444 |  |  |
Cash |  | 1,053 | [1] | 728 | [2] |  |
Restricted Cash | [1] | 104 |  | 123 |  |  |
Insurance and reinsurance balances receivable |  | 10,193 |  | 9,334 |  |  |
Reinsurance Recoverable Losses And Loss Expenses |  | 15,088 |  | 15,034 |  |  |
Reinsurance recoverable on policy benefits |  | 206 |  | 184 |  |  |
Value of business acquired |  | 298 |  | 326 |  |  |
Goodwill and other intangible assets |  | 21,471 |  | 22,054 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 18,108 |  | 16,795 |  |  |
Total assets |  | 167,684 |  | 167,022 |  |  |
Unpaid losses and loss expenses |  | 63,029 |  | 63,179 |  | $ 64,153 | $ 60,540
Unearned premiums |  | 15,725 |  | 15,216 |  |  |
Future policy benefits |  | 5,463 |  | 5,321 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Affiliated notional cash pooling programs |  | 0 |  | 0 |  |  |
Repurchase agreements |  | 1,414 |  | 1,408 |  |  |
Short-term debt |  | 500 |  | 1,013 |  |  |
Long-term debt |  | 12,149 |  | 11,556 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 18,162 |  | 17,849 |  |  |
Total liabilities |  | 116,750 |  | 115,850 |  |  |
Total shareholders' equity |  | 50,934 |  | 51,172 |  | $ 50,471 |
Total liabilities and shareholders’ equity |  | 167,684 |  | 167,022 |  |  |
Chubb Limited (Parent Guarantor) |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | 0 | [1] | 3 | [2] |  |
Restricted Cash | [1] | 0 |  | 0 |  |  |
Insurance and reinsurance balances receivable |  | 0 |  | 0 |  |  |
Reinsurance Recoverable 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 |  | 43,528 |  | 41,909 |  |  |
Due from subsidiaries and affiliates, net |  | 7,917 |  | 9,639 |  |  |
Other assets |  | 3 |  | 3 |  |  |
Total assets |  | 51,448 |  | 51,554 |  |  |
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 |  | 165 | [1] | 0 | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 349 |  | 382 |  |  |
Total liabilities |  | 514 |  | 382 |  |  |
Total shareholders' equity |  | 50,934 |  | 51,172 |  |  |
Total liabilities and shareholders’ equity |  | 51,448 |  | 51,554 |  |  |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 183 |  | 168 |  |  |
Cash |  | 1 | [1] | 1 | [2] |  |
Restricted Cash | [1] | 0 |  | 0 |  |  |
Insurance and reinsurance balances receivable |  | 0 |  | 0 |  |  |
Reinsurance Recoverable 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 |  | 50,132 |  | 51,165 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 678 |  | 287 |  |  |
Total assets |  | 50,994 |  | 51,621 |  |  |
Unpaid losses and loss expenses |  | 0 |  | 0 |  |  |
Unearned premiums |  | 0 |  | 0 |  |  |
Future policy benefits |  | 0 |  | 0 |  |  |
Due to subsidiaries and affiliates, net |  | 8,028 |  | 9,432 |  |  |
Affiliated notional cash pooling programs |  | 81 | [1] | 115 | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 500 |  | 1,013 |  |  |
Long-term debt |  | 12,138 |  | 11,546 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 2,418 |  | 1,411 |  |  |
Total liabilities |  | 23,473 |  | 23,825 |  |  |
Total shareholders' equity |  | 27,521 |  | 27,796 |  |  |
Total liabilities and shareholders’ equity |  | 50,994 |  | 51,621 |  |  |
Other Chubb Limited Subsidiaries |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 100,980 |  | 102,276 |  |  |
Cash |  | 1,298 | [1] | 839 | [2] |  |
Restricted Cash | [1] | 104 |  | 123 |  |  |
Insurance and reinsurance balances receivable |  | 10,486 |  | 10,820 |  |  |
Reinsurance Recoverable Losses And Loss Expenses |  | 26,408 |  | 27,514 |  |  |
Reinsurance recoverable on policy benefits |  | 1,109 |  | 1,194 |  |  |
Value of business acquired |  | 298 |  | 326 |  |  |
Goodwill and other intangible assets |  | 21,471 |  | 22,054 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 111 |  | 0 |  |  |
Other assets |  | 18,985 |  | 20,578 |  |  |
Total assets |  | 181,250 |  | 185,724 |  |  |
Unpaid losses and loss expenses |  | 73,422 |  | 74,767 |  |  |
Unearned premiums |  | 16,793 |  | 18,875 |  |  |
Future policy benefits |  | 6,366 |  | 6,331 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 207 |  |  |
Affiliated notional cash pooling programs |  | 0 | [1] | 0 | [2] |  |
Repurchase agreements |  | 1,414 |  | 1,408 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 11 |  | 10 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 17,105 |  | 18,848 |  |  |
Total liabilities |  | 115,111 |  | 120,446 |  |  |
Total shareholders' equity |  | 66,139 |  | 65,278 |  |  |
Total liabilities and shareholders’ equity |  | 181,250 |  | 185,724 |  |  |
Consolidating Adjustments and Eliminations |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | (246) | [1] | (115) | [2] |  |
Restricted Cash | [1] | 0 |  | 0 |  |  |
Insurance and reinsurance balances receivable |  | (293) |  | (1,486) |  |  |
Reinsurance Recoverable Losses And Loss Expenses |  | (11,320) |  | (12,480) |  |  |
Reinsurance recoverable on policy benefits |  | (903) |  | (1,010) |  |  |
Value of business acquired |  | 0 |  | 0 |  |  |
Goodwill and other intangible assets |  | 0 |  | 0 |  |  |
Investments in subsidiaries |  | (93,660) |  | (93,074) |  |  |
Due from subsidiaries and affiliates, net |  | (8,028) |  | (9,639) |  |  |
Other assets |  | (1,558) |  | (4,073) |  |  |
Total assets |  | (116,008) |  | (121,877) |  |  |
Unpaid losses and loss expenses |  | (10,393) |  | (11,588) |  |  |
Unearned premiums |  | (1,068) |  | (3,659) |  |  |
Future policy benefits |  | (903) |  | (1,010) |  |  |
Due to subsidiaries and affiliates, net |  | (8,028) |  | (9,639) |  |  |
Affiliated notional cash pooling programs |  | (246) | [1] | (115) | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | (1,710) |  | (2,792) |  |  |
Total liabilities |  | (22,348) |  | (28,803) |  |  |
Total shareholders' equity |  | (93,660) |  | (93,074) |  |  |
Total liabilities and shareholders’ equity |  | $ (116,008) |  | $ (121,877) |  |  |
[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, 2018, 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 December 31, 2017, 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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