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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash flows from operating activities | $ 3,897 |  | $ 3,411 |
Purchases of fixed maturities available for sale | (16,788) |  | (18,478) |
Purchases of fixed maturities held to maturity | (380) |  | (262) |
Purchases of equity securities | (148) |  | (125) |
Sales of fixed maturities available for sale | 9,041 |  | 9,215 |
Sales of equity securities | 247 |  | 152 |
Maturities and redemptions of fixed maturities available for sale | 5,482 |  | 7,699 |
Maturities and redemptions of fixed maturities held to maturity | 1,001 |  | 644 |
Net change in short-term investments | 64 |  | 44 |
Net derivative instruments settlements | (46) |  | (170) |
Private equity contribution | (1,112) |  | (485) |
Private equity distribution | 743 |  | 744 |
Capital contribution | 0 |  |  |
Other | (231) |  | (319) |
Net cash flows used for investing activities | (2,127) |  | (1,341) |
Dividends paid on Common Shares | (1,001) |  | (978) |
Common Shares repurchased | (732) |  | (707) |
Proceeds from Issuance of Long-term Debt | 2,171 |  | 0 |
Proceeds from issuance of long-term debt | (2,001) |  | (500) |
Proceeds from issuance of repurchase agreements | 1,572 |  | 1,798 |
Repayments of repurchase agreements | (1,566) |  | (1,793) |
Proceeds from share-based compensation plans | 86 |  | 109 |
Dividend to Parent Company | 0 |  | 0 |
Advances (to) from affiliates | 0 |  | 0 |
Capital contribution | 0 |  |  |
Net proceeds from (payments to) affiliated notional cash pooling program | 0 |  | 0 |
Policyholder contract deposits | 269 |  | 312 |
Policyholder contract withdrawals | (222) |  | (211) |
Net cash flows used for financing activities | (1,424) |  | (1,970) |
Effect of foreign currency rate changes on cash and restricted cash | (40) |  | 5 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 306 |  | 105 |
Cash and Restricted Cash - Beginning of year | 851 |  | 1,088 |
Cash and Restricted Cash - end of Year | 1,157 |  | 1,193 |
Chubb Limited (Parent Guarantor) |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash flows from operating activities | 237 |  | 639 |
Purchases of fixed maturities available for sale | 0 |  | 0 |
Purchases of fixed maturities held to maturity | 0 |  | 0 |
Purchases of equity securities | 0 |  | 0 |
Sales of fixed maturities available for sale | 0 |  | 0 |
Sales of equity securities | 0 |  | 0 |
Maturities and redemptions of fixed maturities available for sale | 0 |  | 0 |
Maturities and redemptions of fixed maturities held to maturity | 0 |  | 0 |
Net change in short-term investments | 0 |  | 0 |
Net derivative instruments settlements | 0 |  | 0 |
Private equity contribution | 0 |  | 0 |
Private equity distribution | 0 |  | 0 |
Capital contribution | (1,125) |  |  |
Other | 0 |  | 0 |
Net cash flows used for investing activities | (1,125) |  | 0 |
Dividends paid on Common Shares | (1,001) |  | (978) |
Common Shares repurchased | 0 |  | 0 |
Proceeds from Issuance of Long-term Debt | 0 |  |  |
Proceeds from issuance of long-term debt | 0 |  | 0 |
Proceeds from issuance of repurchase agreements | 0 |  | 0 |
Repayments of repurchase agreements | 0 |  | 0 |
Proceeds from share-based compensation plans | 0 |  | 0 |
Dividend to Parent Company | 0 |  | 0 |
Advances (to) from affiliates | 1,722 |  | 617 |
Capital contribution | 0 |  |  |
Net proceeds from (payments to) affiliated notional cash pooling program | 165 | [1] | (278) | [2]
Policyholder contract deposits | 0 |  | 0 |
Policyholder contract withdrawals | 0 |  | 0 |
Net cash flows used for financing activities | 886 |  | (639) |
Effect of foreign currency rate changes on cash and restricted cash | (1) |  | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | (3) |  | 0 |
Cash and Restricted Cash - Beginning of year | 3 |  | 1 |
Cash and Restricted Cash - end of Year | 0 |  | 1 |
Chubb INA Holdings Inc (Subsidiary Issuer) |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash flows from operating activities | 4,701 |  | 1,472 |
Purchases of fixed maturities available for sale | (30) |  | (9) |
Purchases of fixed maturities held to maturity | 0 |  | 0 |
Purchases of equity securities | 0 |  | 0 |
Sales of fixed maturities available for sale | 6 |  | 99 |
Sales of equity securities | 0 |  | 0 |
Maturities and redemptions of fixed maturities available for sale | 15 |  | 22 |
Maturities and redemptions of fixed maturities held to maturity | 0 |  | 0 |
Net change in short-term investments | 6 |  | 197 |
Net derivative instruments settlements | (7) |  | (13) |
Private equity contribution | 0 |  | 0 |
Private equity distribution | 0 |  | 0 |
Capital contribution | (3,500) |  |  |
Other | (18) |  | 6 |
Net cash flows used for investing activities | (3,528) |  | 302 |
Dividends paid on Common Shares | 0 |  | 0 |
Common Shares repurchased | 0 |  | 0 |
Proceeds from Issuance of Long-term Debt | 2,171 |  |  |
Proceeds from issuance of long-term debt | (2,000) |  | (500) |
Proceeds from issuance of repurchase agreements | 0 |  | 0 |
Repayments of repurchase agreements | 0 |  | 0 |
Proceeds from share-based compensation plans | 0 |  | 0 |
Dividend to Parent Company | 0 |  | 0 |
Advances (to) from affiliates | (1,310) |  | (658) |
Capital contribution | 0 |  |  |
Net proceeds from (payments to) affiliated notional cash pooling program | (34) | [1] | (617) | [2]
Policyholder contract deposits | 0 |  | 0 |
Policyholder contract withdrawals | 0 |  | 0 |
Net cash flows used for financing activities | (1,173) |  | (1,775) |
Effect of foreign currency rate changes on cash and restricted cash | 0 |  | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 0 |  | (1) |
Cash and Restricted Cash - Beginning of year | 1 |  | 1 |
Cash and Restricted Cash - end of Year | 1 |  | 0 |
Other Chubb Limited Subsidiaries |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash flows from operating activities | 3,797 |  | 3,341 |
Purchases of fixed maturities available for sale | (16,758) |  | (18,469) |
Purchases of fixed maturities held to maturity | (380) |  | (262) |
Purchases of equity securities | (148) |  | (125) |
Sales of fixed maturities available for sale | 9,035 |  | 9,116 |
Sales of equity securities | 247 |  | 152 |
Maturities and redemptions of fixed maturities available for sale | 5,467 |  | 7,677 |
Maturities and redemptions of fixed maturities held to maturity | 1,001 |  | 644 |
Net change in short-term investments | 58 |  | (153) |
Net derivative instruments settlements | (39) |  | (157) |
Private equity contribution | (1,112) |  | (485) |
Private equity distribution | 743 |  | 744 |
Capital contribution | 0 |  |  |
Other | (213) |  | (325) |
Net cash flows used for investing activities | (2,099) |  | (1,643) |
Dividends paid on Common Shares | 0 |  | 0 |
Common Shares repurchased | (732) |  | (707) |
Proceeds from Issuance of Long-term Debt | 0 |  |  |
Proceeds from issuance of long-term debt | (1) |  | 0 |
Proceeds from issuance of repurchase agreements | 1,572 |  | 1,798 |
Repayments of repurchase agreements | (1,566) |  | (1,793) |
Proceeds from share-based compensation plans | 86 |  | 109 |
Dividend to Parent Company | (4,838) |  | (2,041) |
Advances (to) from affiliates | (412) |  | 41 |
Capital contribution | 4,625 |  |  |
Net proceeds from (payments to) affiliated notional cash pooling program | 0 | [1] | 0 | [2]
Policyholder contract deposits | 269 |  | 312 |
Policyholder contract withdrawals | (222) |  | (211) |
Net cash flows used for financing activities | (1,219) |  | (2,492) |
Effect of foreign currency rate changes on cash and restricted cash | (39) |  | 5 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 440 |  | (789) |
Cash and Restricted Cash - Beginning of year | 962 |  | 2,068 |
Cash and Restricted Cash - end of Year | 1,402 |  | 1,279 |
Consolidation, Eliminations [Member] |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash flows from operating activities | (4,838) |  | (2,041) |
Purchases of fixed maturities available for sale | 0 |  | 0 |
Purchases of fixed maturities held to maturity | 0 |  | 0 |
Purchases of equity securities | 0 |  | 0 |
Sales of fixed maturities available for sale | 0 |  | 0 |
Sales of equity securities | 0 |  | 0 |
Maturities and redemptions of fixed maturities available for sale | 0 |  | 0 |
Maturities and redemptions of fixed maturities held to maturity | 0 |  | 0 |
Net change in short-term investments | 0 |  | 0 |
Net derivative instruments settlements | 0 |  | 0 |
Private equity contribution | 0 |  | 0 |
Private equity distribution | 0 |  | 0 |
Capital contribution | 4,625 |  |  |
Other | 0 |  | 0 |
Net cash flows used for investing activities | 4,625 |  | 0 |
Dividends paid on Common Shares | 0 |  | 0 |
Common Shares repurchased | 0 |  | 0 |
Proceeds from Issuance of Long-term Debt | 0 |  |  |
Proceeds from issuance of long-term debt | 0 |  | 0 |
Proceeds from issuance of repurchase agreements | 0 |  | 0 |
Repayments of repurchase agreements | 0 |  | 0 |
Proceeds from share-based compensation plans | 0 |  | 0 |
Dividend to Parent Company | 4,838 |  | 2,041 |
Advances (to) from affiliates | 0 |  | 0 |
Capital contribution | (4,625) |  |  |
Net proceeds from (payments to) affiliated notional cash pooling program | (131) | [1] | 895 | [2]
Policyholder contract deposits | 0 |  | 0 |
Policyholder contract withdrawals | 0 |  | 0 |
Net cash flows used for financing activities | 82 |  | 2,936 |
Effect of foreign currency rate changes on cash and restricted cash | 0 |  | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | (131) |  | 895 |
Cash and Restricted Cash - Beginning of year | (115) |  | (982) |
Cash and Restricted Cash - end of Year | $ (246) |  | $ (87) |
[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 and December 31, 2017, 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 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow through purchase of long-term held-to-maturity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Cash inflow received as distributions, returns of capital, or sale proceeds from partnership interests held for investment purposes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition The cash flow from investments sold under the agreement to repurchase such investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3095-108585 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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