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Information provided in connection with outstanding debt of subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |
Investments |  | $ 100,968 |  | $ 102,444 |  |  |
Cash |  | 1,247 | [1] | 728 | [2] | $ 985 |
Restricted Cash |  | 93 | [1] | 123 | [2] | 103 |
Insurance and reinsurance balances receivable |  | 10,075 |  | 9,334 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 15,993 |  | 15,034 |  |  |
Reinsurance Recoverable Future Policy Benefits |  | 202 |  | 184 |  |  |
Value of business acquired |  | 295 |  | 326 |  | 355 | $ 395
Goodwill |  | 21,414 |  | 22,054 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 17,484 |  | 16,795 |  |  |
Total assets |  | 167,771 |  | 167,022 |  |  |
Unpaid losses and loss expenses |  | 62,960 |  | 63,179 |  | 60,540 | 37,303
Unearned premiums |  | 15,532 |  | 15,216 |  |  |
Future policy benefits |  | 5,506 |  | 5,321 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Affiliated notional cash pooling program |  | 0 | [1] | 0 | [2] |  |
Repurchase agreements |  | 1,418 |  | 1,408 |  |  |
Short-term debt |  | 509 |  | 1,013 |  |  |
Long-term debt |  | 12,087 |  | 11,556 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 19,139 |  | 17,849 |  |  |
Total liabilities |  | 117,459 |  | 115,850 |  |  |
Total shareholders' equity |  | 50,312 |  | 51,172 |  |  |
Total liabilities and shareholders’ equity |  | 167,771 |  | 167,022 |  |  |
Consolidating Adjustments |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | (652) | [1] | (115) | [2] |  |
Restricted Cash |  | 0 | [1] | 0 | [2] |  |
Insurance and reinsurance balances receivable |  | (1,786) |  | (1,486) |  |  |
Reinsurance recoverable on losses and loss expenses |  | (10,429) |  | (12,480) |  |  |
Reinsurance Recoverable Future Policy Benefits |  | (104) |  | (1,010) |  |  |
Value of business acquired |  | 0 |  | 0 |  |  |
Goodwill |  | 0 |  | 0 |  |  |
Investments in subsidiaries |  | (93,740) |  | (93,074) |  |  |
Due from subsidiaries and affiliates, net |  | (7,672) |  | (9,639) |  |  |
Other assets |  | (1,628) |  | (4,073) |  |  |
Total assets |  | (116,011) |  | (121,877) |  |  |
Unpaid losses and loss expenses |  | (9,897) |  | (11,588) |  |  |
Unearned premiums |  | (1,079) |  | (3,659) |  |  |
Future policy benefits |  | (104) |  | (1,010) |  |  |
Due to subsidiaries and affiliates, net |  | (7,672) |  | (9,639) |  |  |
Affiliated notional cash pooling program |  | (652) | [1] | (115) | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | (2,867) |  | (2,792) |  |  |
Total liabilities |  | (22,271) |  | (28,803) |  |  |
Total shareholders' equity |  | (93,740) |  | (93,074) |  |  |
Total liabilities and shareholders’ equity |  | (116,011) |  | (121,877) |  |  |
Chubb limited (Parent Guarantor) |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | 1 | [1] | 3 | [2] | $ 1 | $ 1
Restricted Cash |  | 0 | [1] | 0 | [2] |  |
Insurance and reinsurance balances receivable |  | 0 |  | 0 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 0 |  | 0 |  |  |
Reinsurance Recoverable Future Policy Benefits |  | 0 |  | 0 |  |  |
Value of business acquired |  | 0 |  | 0 |  |  |
Goodwill |  | 0 |  | 0 |  |  |
Investments in subsidiaries |  | 43,531 |  | 41,909 |  |  |
Due from subsidiaries and affiliates, net |  | 7,074 |  | 9,639 |  |  |
Other assets |  | 3 |  | 3 |  |  |
Total assets |  | 50,609 |  | 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 program | [3] | 35 | [1] | 0 | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 262 |  | 382 |  |  |
Total liabilities |  | 297 |  | 382 |  |  |
Total shareholders' equity |  | 50,312 |  | 51,172 |  |  |
Total liabilities and shareholders’ equity |  | 50,609 |  | 51,554 |  |  |
Chubb INA Holdings Inc. (Subsidiary Issuer) |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |
Investments |  | 214 |  | 168 |  |  |
Cash |  | 2 | [1] | 1 | [2] |  |
Restricted Cash |  | 0 | [1] | 0 | [2] |  |
Insurance and reinsurance balances receivable |  | 0 |  | 0 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 0 |  | 0 |  |  |
Reinsurance Recoverable Future Policy Benefits |  | 0 |  | 0 |  |  |
Value of business acquired |  | 0 |  | 0 |  |  |
Goodwill |  | 0 |  | 0 |  |  |
Investments in subsidiaries |  | 50,209 |  | 51,165 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 1,007 |  | 287 |  |  |
Total assets |  | 51,432 |  | 51,621 |  |  |
Unpaid losses and loss expenses |  | 0 |  | 0 |  |  |
Unearned premiums |  | 0 |  | 0 |  |  |
Future policy benefits |  | 0 |  | 0 |  |  |
Due to subsidiaries and affiliates, net |  | 7,672 |  | 9,432 |  |  |
Affiliated notional cash pooling program |  | 617 | [1] | 115 | [2] |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 500 |  | 1,013 |  |  |
Long-term debt |  | 12,086 |  | 11,546 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 2,545 |  | 1,411 |  |  |
Total liabilities |  | 23,728 |  | 23,825 |  |  |
Total shareholders' equity |  | 27,704 |  | 27,796 |  |  |
Total liabilities and shareholders’ equity |  | 51,432 |  | 51,621 |  |  |
Other Chubb Limited Subsidiaries and Eliminations |  |  |  |  |  |  |
Information Provided In Connection With Outstanding Debt Of Subsidiaries [Line Items] |  |  |  |  |  |  |
Investments |  | 100,754 |  | 102,276 |  |  |
Cash |  | 1,896 | [1] | 839 | [2] |  |
Restricted Cash |  | 93 | [1] | 123 | [2] |  |
Insurance and reinsurance balances receivable |  | 11,861 |  | 10,820 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 26,422 |  | 27,514 |  |  |
Reinsurance Recoverable Future Policy Benefits |  | 306 |  | 1,194 |  |  |
Value of business acquired |  | 295 |  | 326 |  |  |
Goodwill |  | 21,414 |  | 22,054 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 598 |  | 0 |  |  |
Other assets |  | 18,102 |  | 20,578 |  |  |
Total assets |  | 181,741 |  | 185,724 |  |  |
Unpaid losses and loss expenses |  | 72,857 |  | 74,767 |  |  |
Unearned premiums |  | 16,611 |  | 18,875 |  |  |
Future policy benefits |  | 5,610 |  | 6,331 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 207 |  |  |
Affiliated notional cash pooling program |  | 0 | [1] | 0 | [2] |  |
Repurchase agreements |  | 1,418 |  | 1,408 |  |  |
Short-term debt |  | 9 |  | 0 |  |  |
Long-term debt |  | 1 |  | 10 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 19,199 |  | 18,848 |  |  |
Total liabilities |  | 115,705 |  | 120,446 |  |  |
Total shareholders' equity |  | 66,036 |  | 65,278 |  |  |
Total liabilities and shareholders’ equity |  | $ 181,741 |  | $ 185,724 |  |  |
[1] | Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 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. Refer to Note 1 f) for additional information. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.
[3] | (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information.

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