Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2017		Dec. 31, 2016
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost – $80,363 and $79,536)(includes hybrid financial instruments of $2 and $2)		$ 81,645		$ 80,115
Fixed maturities held to maturity, at amortized cost (fair value – $10,560 and $10,670)		10,371		10,644
Equity securities, at fair value (cost – $697 and $706)		856		814
Short-term investments, at fair value and amortized cost		2,651		3,002
Other investments (cost – $4,410 and $4,270)		4,685		4,519
Total investments		100,208		99,094
Cash	[1]	1,297	[2]	985	[3]
Securities lending collateral		1,545		1,092
Accrued investment income		901		918
Insurance and reinsurance balances receivable		9,662		8,970
Reinsurance recoverable on losses and loss expenses		13,358		13,577
Reinsurance recoverable on policy benefits		198		182
Deferred policy acquisition costs		4,546		4,314
Value of business acquired		337		355
Goodwill		15,434		15,332
Other intangible assets		6,579		6,763
Prepaid reinsurance premiums		2,592		2,448
Investments in partially-owned insurance companies		662		666
Other assets		5,669		5,090
Total assets		162,988		159,786
Liabilities
Unpaid losses and loss expenses		60,394		60,540
Unearned premiums		15,289		14,779
Future policy benefits		5,190		5,036
Insurance and reinsurance balances payable		5,841		5,637
Securities lending payable		1,546		1,093
Accounts payable, accrued expenses, and other liabilities		8,952		8,617
Deferred tax liabilities		1,122		988
Repurchase agreements		1,408		1,403
Short-term debt		922		500
Long-term debt		11,667		12,610
Trust preferred securities		308		308
Total liabilities		112,639		111,511
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 465,375,141 and 465,968,716 shares outstanding)		11,121		11,121
Common Shares in treasury (14,408,723 and 13,815,148 shares)		(1,675)		(1,480)
Additional paid-in capital		14,522		15,335
Retained earnings		26,011		23,613
Accumulated other comprehensive income (loss) (AOCI)		370		(314)
Total shareholders’ equity		50,349		48,275
Total liabilities and shareholders’ equity		$ 162,988		$ 159,786

[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, 2017 and December 31, 2016, 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, 2017, 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, 2016, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.