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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flows from operating activities $ 551 $ 1,013
Purchases of fixed maturities available for sale (5,972) (6,250)
Purchases of fixed maturities held to maturity (162) (157)
Purchases of equity securities (55) (37)
Sales of fixed maturities available for sale 2,562 3,395
Sales of equity securities 40 46
Maturities and redemptions of fixed maturities available for sale 1,865 2,543
Maturities and redemptions of fixed maturities held to maturity 255 240
Net change in short-term investments 731 232
Net derivative instruments settlements 39 (89)
Private equity contribution (353) (198)
Private equity distribution 201 315
Payment Of Contributions To Subsidiary 0  
Other (32) (106)
Net cash flows used for investing activities (881) (66)
Dividends paid on Common Shares (330) (324)
Common Shares repurchased (29) (128)
Proceeds from Issuance of Long-term Debt 2,175 0
Proceeds from issuance of long-term debt (300) (500)
Proceeds from issuance of repurchase agreements 408 753
Repayments of repurchase agreements (404) (752)
Proceeds from share-based compensation plans 34 42
Dividend to Parent Company 0 0
Advances (to) from affiliates 0 0
Capital contribution 0 0
Net proceeds from (payments to) affiliated notional cash pooling program 0 0
Policyholder contract deposits 118 109
Policyholder contract withdrawals (105) (58)
Net cash flows from (used for) financing activities 1,567 (858)
Effect of foreign currency rate changes on cash and restricted cash 25 (17)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 1,262 72
Cash and Restricted Cash - Beginning of year 851 1,088
Cash and Restricted Cash - end of Year 2,113 1,160
Chubb Limited (Parent Guarantor)    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flows from operating activities 24 584
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
Payment Of Contributions To Subsidiary 750  
Other 0 0
Net cash flows used for investing activities (750) 0
Dividends paid on Common Shares (330) (324)
Common Shares repurchased 0 0
Proceeds from Issuance of Long-term Debt 0 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 656 108
Capital contribution 0 0
Net proceeds from (payments to) affiliated notional cash pooling program 400 [1] (363) [2]
Policyholder contract deposits 0 0
Policyholder contract withdrawals 0 0
Net cash flows from (used for) financing activities 726 (579)
Effect of foreign currency rate changes on cash and restricted cash (2) 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (2) 5
Cash and Restricted Cash - Beginning of year 3 1
Cash and Restricted Cash - end of Year 1 6
Chubb INA Holdings Inc (Subsidiary Issuer)    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flows from operating activities 2,727 (156)
Purchases of fixed maturities available for sale (8) (4)
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 3 7
Maturities and redemptions of fixed maturities held to maturity 0 0
Net change in short-term investments (14) 173
Net derivative instruments settlements (7) (2)
Private equity contribution 0 0
Private equity distribution 0 0
Payment Of Contributions To Subsidiary 3,500  
Other (3) 0
Net cash flows used for investing activities (3,529) 174
Dividends paid on Common Shares 0 0
Common Shares repurchased 0 0
Proceeds from Issuance of Long-term Debt 2,175 0
Proceeds from issuance of long-term debt (300) (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 (95) (171)
Capital contribution 0 0
Net proceeds from (payments to) affiliated notional cash pooling program (115) [1] 653 [2]
Policyholder contract deposits 0 0
Policyholder contract withdrawals 0 0
Net cash flows from (used for) financing activities 1,665 (18)
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 863 0
Cash and Restricted Cash - Beginning of year 1 1
Cash and Restricted Cash - end of Year 864 1
Other Chubb Limited Subsidiaries    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flows from operating activities 800 1,081
Purchases of fixed maturities available for sale (5,964) (6,246)
Purchases of fixed maturities held to maturity (162) (157)
Purchases of equity securities (55) (37)
Sales of fixed maturities available for sale 2,562 3,395
Sales of equity securities 40 46
Maturities and redemptions of fixed maturities available for sale 1,862 2,536
Maturities and redemptions of fixed maturities held to maturity 255 240
Net change in short-term investments 745 59
Net derivative instruments settlements 46 (87)
Private equity contribution (353) (198)
Private equity distribution 201 315
Payment Of Contributions To Subsidiary 0  
Other (29) (106)
Net cash flows used for investing activities (852) (240)
Dividends paid on Common Shares 0 0
Common Shares repurchased (29) (128)
Proceeds from Issuance of Long-term Debt 0 0
Proceeds from issuance of long-term debt 0 0
Proceeds from issuance of repurchase agreements 408 753
Repayments of repurchase agreements (404) (752)
Proceeds from share-based compensation plans 34 42
Dividend to Parent Company (3,000) (496)
Advances (to) from affiliates (561) 63
Capital contribution 4,250 0
Net proceeds from (payments to) affiliated notional cash pooling program 0 [1] 0 [2]
Policyholder contract deposits 118 109
Policyholder contract withdrawals (105) (58)
Net cash flows from (used for) financing activities 711 (467)
Effect of foreign currency rate changes on cash and restricted cash 27 (17)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 686 357
Cash and Restricted Cash - Beginning of year 962 2,068
Cash and Restricted Cash - end of Year 1,648 2,425
Consolidation, Eliminations [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash flows from operating activities (3,000) (496)
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
Payment Of Contributions To Subsidiary (4,250)  
Other 0 0
Net cash flows used for investing activities 4,250 0
Dividends paid on Common Shares 0 0
Common Shares repurchased 0 0
Proceeds from Issuance of Long-term Debt 0 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 3,000 496
Advances (to) from affiliates 0 0
Capital contribution (4,250) 0
Net proceeds from (payments to) affiliated notional cash pooling program (285) [1] (290)
Policyholder contract deposits 0 0
Policyholder contract withdrawals 0 0
Net cash flows from (used for) financing activities (1,535) 206
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 (285) (290)
Cash and Restricted Cash - Beginning of year (115) (982)
Cash and Restricted Cash - end of Year $ (400) $ (1,272)
[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 March 31, 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 March 31, 2017 and December 31, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.