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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]        
Investments $ 101,186 $ 102,444    
Cash 1,000 [1] 728 [2]    
Restricted Cash [1] 101 123    
Insurance and reinsurance balances receivable 10,341 9,334    
Reinsurance Recoverable Losses And Loss Expenses 14,792 15,034    
Reinsurance recoverable on policy benefits 204 184    
Value of business acquired 311 326    
Goodwill and other intangible assets 21,759 22,054    
Investments in subsidiaries 0 0    
Due from subsidiaries and affiliates, net 0 0    
Other assets 17,840 16,795    
Total assets 167,534 167,022    
Unpaid losses and loss expenses 62,778 63,179 $ 60,394 $ 60,540
Unearned premiums 15,748 15,216    
Future policy benefits 5,470 5,321    
Due to subsidiaries and affiliates, net 0 0    
Affiliated notional cash pooling programs 0 0    
Repurchase agreements 1,413 1,408    
Short-term debt 600 1,013    
Long-term debt 12,184 11,556    
Trust preferred securities 308 308    
Other liabilities 18,062 17,849    
Total liabilities 116,563 115,850    
Total shareholders' equity 50,971 51,172 $ 50,349  
Total liabilities and shareholders’ equity 167,534 167,022    
Chubb Limited (Parent Guarantor)        
Condensed Balance Sheet Statements, Captions [Line Items]        
Investments 0 0    
Cash 1 [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 42,919 41,909    
Due from subsidiaries and affiliates, net 8,686 9,639    
Other assets 2 3    
Total assets 51,608 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 403 [1] 0 [2]    
Repurchase agreements 0 0    
Short-term debt 0 0    
Long-term debt 0 0    
Trust preferred securities 0 0    
Other liabilities 234 382    
Total liabilities 637 382    
Total shareholders' equity 50,971 51,172    
Total liabilities and shareholders’ equity 51,608 51,554    
Chubb INA Holdings Inc (Subsidiary Issuer)        
Condensed Balance Sheet Statements, Captions [Line Items]        
Investments 172 168    
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 51,706 51,165    
Due from subsidiaries and affiliates, net 0 0    
Other assets 655 287    
Total assets 52,534 51,621    
Unpaid losses and loss expenses 0 0    
Unearned premiums 0 0    
Future policy benefits 0 0    
Due to subsidiaries and affiliates, net 8,943 9,432    
Affiliated notional cash pooling programs 837 [1] 115 [2]    
Repurchase agreements 0 0    
Short-term debt 600 1,013    
Long-term debt 12,173 11,546    
Trust preferred securities 308 308    
Other liabilities 2,248 1,411    
Total liabilities 25,109 23,825    
Total shareholders' equity 27,425 27,796    
Total liabilities and shareholders’ equity 52,534 51,621    
Other Chubb Limited Subsidiaries        
Condensed Balance Sheet Statements, Captions [Line Items]        
Investments 101,014 102,276    
Cash 2,238 [1] 839 [2]    
Restricted Cash [1] 101 123    
Insurance and reinsurance balances receivable 11,297 10,820    
Reinsurance Recoverable Losses And Loss Expenses 27,117 27,514    
Reinsurance recoverable on policy benefits 1,127 1,194    
Value of business acquired 311 326    
Goodwill and other intangible assets 21,759 22,054    
Investments in subsidiaries 0 0    
Due from subsidiaries and affiliates, net 257 0    
Other assets 18,760 20,578    
Total assets 183,981 185,724    
Unpaid losses and loss expenses 73,427 74,767    
Unearned premiums 16,815 18,875    
Future policy benefits 6,393 6,331    
Due to subsidiaries and affiliates, net 0 207    
Affiliated notional cash pooling programs 0 [1] 0 [2]    
Repurchase agreements 1,413 1,408    
Short-term debt 0 0    
Long-term debt 11 10    
Trust preferred securities 0 0    
Other liabilities 18,722 18,848    
Total liabilities 116,781 120,446    
Total shareholders' equity 67,200 65,278    
Total liabilities and shareholders’ equity 183,981 185,724    
Consolidating Adjustments and Eliminations        
Condensed Balance Sheet Statements, Captions [Line Items]        
Investments 0 0    
Cash (1,240) [1] (115) [2]    
Restricted Cash [1] 0 0    
Insurance and reinsurance balances receivable (956) (1,486)    
Reinsurance Recoverable Losses And Loss Expenses (12,325) (12,480)    
Reinsurance recoverable on policy benefits (923) (1,010)    
Value of business acquired 0 0    
Goodwill and other intangible assets 0 0    
Investments in subsidiaries (94,625) (93,074)    
Due from subsidiaries and affiliates, net (8,943) (9,639)    
Other assets (1,577) (4,073)    
Total assets (120,589) (121,877)    
Unpaid losses and loss expenses (10,649) (11,588)    
Unearned premiums (1,067) (3,659)    
Future policy benefits (923) (1,010)    
Due to subsidiaries and affiliates, net (8,943) (9,639)    
Affiliated notional cash pooling programs (1,240) [1] (115) [2]    
Repurchase agreements 0 0    
Short-term debt 0 0    
Long-term debt 0 0    
Trust preferred securities 0 0    
Other liabilities (3,142) (2,792)    
Total liabilities (25,964) (28,803)    
Total shareholders' equity (94,625) (93,074)    
Total liabilities and shareholders’ equity $ (120,589) $ (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 June 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.