Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2016		Dec. 31, 2015
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $75,991 and $43,149) (includes hybrid financial instruments of $3 and $31)		$ 77,538		$ 43,587
Fixed maturities held to maturity, at amortized cost (fair value – $11,580 and $8,552)		11,280		8,430
Equity securities, at fair value (cost – $841 and $441)		893		497
Short-term investments, at fair value and amortized cost		3,382		10,446
Other investments (cost – $4,233 and $2,993)		4,493		3,291
Total investments		97,586		66,251
Cash	[1]	1,091	[2]	1,775	[3]
Securities lending collateral		1,003		1,046
Accrued investment income		891		513
Insurance and reinsurance balances receivable		7,692		5,323
Reinsurance recoverable on losses and loss expenses		12,891		11,386
Reinsurance recoverable on policy benefits		185		187
Deferred policy acquisition costs		3,376		2,873
Value of business acquired		390		395
Goodwill		15,404		4,796
Other intangible assets		7,955		887
Prepaid reinsurance premiums		2,376		2,082
Deferred tax assets		0		318
Investments in partially-owned insurance companies		654		653
Other assets		5,150		3,821
Total assets		156,644		102,306
Liabilities
Unpaid losses and loss expenses		60,206		37,303
Unearned premiums		14,896		8,439
Future policy benefits		4,869		4,807
Insurance and reinsurance balances payable		4,733		4,270
Securities lending payable		1,004		1,047
Accounts payable, accrued expenses, and other liabilities		9,050		6,205
Deferred Tax Liabilities, Net		1,142		0
Short-term debt		500		0
Long-term debt		12,636		9,389
Trust preferred securities		308		307
Repurchase Agreements		1,403		1,404
Total liabilities		$ 110,747		$ 73,171
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 464,283,520 and 324,563,441 shares outstanding)		$ 11,121		$ 7,833
Common Shares in treasury (15,500,344 and 18,268,971 shares)		(1,648)		(1,922)
Additional paid-in capital		16,140		4,481
Retained earnings		19,917		19,478
Accumulated other comprehensive income (loss) (AOCI)		367		(735)
Total shareholders’ equity		45,897		29,135
Total liabilities and shareholders’ equity		$ 156,644		$ 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 March 31, 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 March 31, 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.