Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $78,630 and $43,149) (includes hybrid financial instruments of $5 and $31)		$ 81,358		$ 43,587
Fixed maturities held to maturity, at amortized cost (fair value – $11,366 and $8,552)		10,927		8,430
Equity securities, at fair value (cost – $695 and $441)		803		497
Short-term investments, at fair value and amortized cost		3,548		10,446
Other investments (cost – $4,170 and $2,993)		4,400		3,291
Total investments		101,036		66,251
Cash	[1]	870	[2]	1,775	[3]
Securities lending collateral		1,140		1,046
Accrued investment income		915		513
Insurance and reinsurance balances receivable		8,493		5,323
Reinsurance recoverable on losses and loss expenses		13,448		11,386
Reinsurance recoverable on policy benefits		195		187
Deferred policy acquisition costs		4,238		2,873
Value of business acquired		368		395
Goodwill		15,481		4,796
Other intangible assets		6,991		887
Prepaid reinsurance premiums		2,449		2,082
Deferred tax assets		0		318
Investments in partially-owned insurance companies		665		653
Other assets		5,521		3,821
Total assets		161,810		102,306
Liabilities
Unpaid losses and loss expenses		61,347		37,303
Unearned premiums		15,054		8,439
Future policy benefits		5,010		4,807
Insurance and reinsurance balances payable		4,885		4,270
Securities lending payable		1,141		1,047
Accounts payable, accrued expenses, and other liabilities		9,748		6,205
Deferred tax liabilities		1,418		0
Repurchase agreements		1,406		1,404
Short-term debt		500		0
Long-term debt		12,621		9,389
Trust preferred securities		308		307
Total liabilities		113,438		73,171
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 465,286,110 and 324,563,441 shares outstanding)		11,121		7,833
Common Shares in treasury (14,497,754 and 18,268,971 shares)		(1,550)		(1,922)
Additional paid-in capital		15,601		4,481
Retained earnings		22,003		19,478
Accumulated other comprehensive income (loss) (AOCI)		1,197		(735)
Total shareholders’ equity		48,372		29,135
Total liabilities and shareholders’ equity		$ 161,810		$ 102,306

[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, 2016 and December 31, 2015, 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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3] 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, 2015, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.