Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2016		Dec. 31, 2015
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $77,436 and $43,149) (includes hybrid financial instruments of $2 and $31)		$ 79,951		$ 43,587
Fixed maturities held to maturity, at amortized cost (fair value – $11,581 and $8,552)		11,090		8,430
Equity securities, at fair value (cost – $703 and $441)		787		497
Short-term investments, at fair value and amortized cost		3,631		10,446
Other investments (cost – $4,152 and $2,993)		4,387		3,291
Total investments		99,846		66,251
Cash	[1]	1,011	[2]	1,775	[3]
Securities lending collateral		1,142		1,046
Accrued investment income		919		513
Insurance and reinsurance balances receivable		8,532		5,323
Reinsurance recoverable on losses and loss expenses		13,235		11,386
Reinsurance recoverable on policy benefits		199		187
Deferred policy acquisition costs		3,948		2,873
Value of business acquired		381		395
Goodwill		15,525		4,796
Other intangible assets		7,398		887
Prepaid reinsurance premiums		2,464		2,082
Deferred tax assets		0		318
Investments in partially-owned insurance companies		658		653
Other assets		4,945		3,821
Total assets		160,203		102,306
Liabilities
Unpaid losses and loss expenses		60,819		37,303
Unearned premiums		15,229		8,439
Future policy benefits		4,975		4,807
Insurance and reinsurance balances payable		4,944		4,270
Securities lending payable		1,143		1,047
Accounts payable, accrued expenses, and other liabilities		9,614		6,205
Deferred tax liabilities		1,409		0
Short-term debt		500		0
Long-term debt		12,631		9,389
Trust preferred securities		308		307
Repurchase Agreements		1,405		1,404
Total liabilities		112,977		73,171
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 and 342,832,412 shares issued; 465,012,980 and 324,563,441 shares outstanding)		11,121		7,833
Common Shares in treasury (14,770,884 and 18,268,971 shares)		(1,577)		(1,922)
Additional paid-in capital		15,858		4,481
Retained earnings		20,643		19,478
Accumulated other comprehensive income (loss) (AOCI)		1,181		(735)
Total shareholders’ equity		47,226		29,135
Total liabilities and shareholders’ equity		$ 160,203		$ 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 June 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 June 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.