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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | $ 116,047 |  | $ 109,234 |  |  |
Cash |  | 1,707 | [1] | 1,537 | [2] |  |
Restricted cash |  | 166 |  | 109 |  |  |
Insurance and reinsurance balances receivable |  | 10,588 |  | 10,357 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 15,670 |  | 15,181 |  |  |
Reinsurance recoverable on policy benefits |  | 203 |  | 197 |  |  |
Operating Lease, Right-of-Use Asset |  | 470 |  | 551 |  |  |
Value of business acquired |  | 286 |  | 306 |  |  |
Goodwill and other intangible assets |  | 21,103 |  | 21,359 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 22,016 |  | 18,663 |  |  |
Total assets |  | 187,786 |  | 176,943 |  |  |
Unpaid losses and loss expenses |  | 67,905 |  | 62,690 |  | $ 63,012 | $ 62,960
Unearned premiums |  | 17,502 |  | 16,771 |  |  |
Future policy benefits |  | 5,955 |  | 5,814 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Affiliated notional cash pooling programs |  | 0 |  |  |  |  |
Operating Lease, Liability |  | 517 |  | 603 |  |  |
Repurchase agreements |  | 1,413 |  | 1,416 |  |  |
Short-term debt |  | 1,300 |  | 1,299 |  |  |
Long-term debt |  | 14,830 |  | 13,559 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 22,160 |  | 19,755 |  |  |
Total liabilities |  | 131,373 |  | 121,612 |  |  |
Total shareholders' equity |  | 56,413 |  | 55,331 |  | $ 54,572 |
Total liabilities and shareholders’ equity |  | 187,786 |  | 176,943 |  |  |
Chubb Limited (Parent Guarantor) |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | 31 | [1] | 2 | [2] |  |
Restricted cash |  | 0 |  | 0 |  |  |
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 |  | 53,715 |  | 50,853 |  |  |
Due from subsidiaries and affiliates, net |  | 2,991 |  | 4,776 |  |  |
Other assets |  | 8 |  | 12 |  |  |
Total assets |  | 56,745 |  | 55,643 |  |  |
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 | [1] | 0 |  |  |  |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 332 |  | 312 |  |  |
Total liabilities |  | 332 |  | 312 |  |  |
Total shareholders' equity |  | 56,413 |  | 55,331 |  |  |
Total liabilities and shareholders’ equity |  | 56,745 |  | 55,643 |  |  |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 724 |  | 1,013 |  |  |
Cash |  | 0 | [1] | 442 | [2] |  |
Restricted cash |  | 0 |  | 0 |  |  |
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 |  | 54,125 |  | 52,076 |  |  |
Due from subsidiaries and affiliates, net |  | 0 |  | 0 |  |  |
Other assets |  | 391 |  | 408 |  |  |
Total assets |  | 55,240 |  | 53,939 |  |  |
Unpaid losses and loss expenses |  | 0 |  | 0 |  |  |
Unearned premiums |  | 0 |  | 0 |  |  |
Future policy benefits |  | 0 |  | 0 |  |  |
Due to subsidiaries and affiliates, net |  | 3,162 |  | 4,446 |  |  |
Affiliated notional cash pooling programs | [1] | 123 |  |  |  |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 1,300 |  | 1,298 |  |  |
Long-term debt |  | 14,830 |  | 13,559 |  |  |
Trust preferred securities |  | 308 |  | 308 |  |  |
Other liabilities |  | 1,374 |  | 1,649 |  |  |
Total liabilities |  | 21,097 |  | 21,260 |  |  |
Total shareholders' equity |  | 34,143 |  | 32,679 |  |  |
Total liabilities and shareholders’ equity |  | 55,240 |  | 53,939 |  |  |
Other Chubb Limited Subsidiaries |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 115,323 |  | 108,221 |  |  |
Cash |  | 1,799 | [1] | 1,093 | [2] |  |
Restricted cash |  | 166 |  | 109 |  |  |
Insurance and reinsurance balances receivable |  | 13,684 |  | 12,920 |  |  |
Reinsurance recoverable on losses and loss expenses |  | 25,482 |  | 24,780 |  |  |
Reinsurance recoverable on policy benefits |  | 298 |  | 292 |  |  |
Value of business acquired |  | 286 |  | 306 |  |  |
Goodwill and other intangible assets |  | 21,103 |  | 21,359 |  |  |
Investments in subsidiaries |  | 0 |  | 0 |  |  |
Due from subsidiaries and affiliates, net |  | 171 |  | 0 |  |  |
Other assets |  | 23,459 |  | 20,072 |  |  |
Total assets |  | 201,771 |  | 189,152 |  |  |
Unpaid losses and loss expenses |  | 77,467 |  | 71,916 |  |  |
Unearned premiums |  | 18,695 |  | 17,978 |  |  |
Future policy benefits |  | 6,050 |  | 5,909 |  |  |
Due to subsidiaries and affiliates, net |  | 0 |  | 330 |  |  |
Affiliated notional cash pooling programs | [1] | 0 |  |  |  |  |
Repurchase agreements |  | 1,413 |  | 1,416 |  |  |
Short-term debt |  | 0 |  | 1 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | 24,449 |  | 21,352 |  |  |
Total liabilities |  | 128,074 |  | 118,902 |  |  |
Total shareholders' equity |  | 73,697 |  | 70,250 |  |  |
Total liabilities and shareholders’ equity |  | 201,771 |  | 189,152 |  |  |
Consolidating Adjustments and Eliminations |  |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |  |
Investments |  | 0 |  | 0 |  |  |
Cash |  | (123) | [1] | 0 | [2] |  |
Restricted cash |  | 0 |  | 0 |  |  |
Insurance and reinsurance balances receivable |  | (3,096) |  | (2,563) |  |  |
Reinsurance recoverable on losses and loss expenses |  | (9,812) |  | (9,599) |  |  |
Reinsurance recoverable on policy benefits |  | (95) |  | (95) |  |  |
Value of business acquired |  | 0 |  | 0 |  |  |
Goodwill and other intangible assets |  | 0 |  | 0 |  |  |
Investments in subsidiaries |  | (107,840) |  | (102,929) |  |  |
Due from subsidiaries and affiliates, net |  | (3,162) |  | (4,776) |  |  |
Other assets |  | (1,842) |  | (1,829) |  |  |
Total assets |  | (125,970) |  | (121,791) |  |  |
Unpaid losses and loss expenses |  | (9,562) |  | (9,226) |  |  |
Unearned premiums |  | (1,193) |  | (1,207) |  |  |
Future policy benefits |  | (95) |  | (95) |  |  |
Due to subsidiaries and affiliates, net |  | (3,162) |  | (4,776) |  |  |
Affiliated notional cash pooling programs | [1] | (123) |  |  |  |  |
Repurchase agreements |  | 0 |  | 0 |  |  |
Short-term debt |  | 0 |  | 0 |  |  |
Long-term debt |  | 0 |  | 0 |  |  |
Trust preferred securities |  | 0 |  | 0 |  |  |
Other liabilities |  | (3,995) |  | (3,558) |  |  |
Total liabilities |  | (18,130) |  | (18,862) |  |  |
Total shareholders' equity |  | (107,840) |  | (102,929) |  |  |
Total liabilities and shareholders’ equity |  | $ (125,970) |  | $ (121,791) |  |  |
[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, 2020, 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 the 2019 Form 10-K for additional information.

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