Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2017		Dec. 31, 2016
Investments [Abstract]
Fixed maturities available for sale, at fair value (amortized cost - $79,957 and $79,536) (includes hybrid financial instruments of $2)		$ 80,806		$ 80,115
Fixed maturities held to maturity, at amortized cost (fair value – $10,604 and $10,670)		10,519		10,644
Equity securities, at fair value (cost – $699 and $706)		835		814
Short-term investments, at fair value and amortized cost		2,780		3,002
Other investments (cost – $4,271 and $4,270)		4,551		4,519
Total investments		99,491		99,094
Cash	[1]	1,063	[2]	985	[3]
Securities lending collateral		1,071		1,092
Accrued investment income		897		918
Insurance and reinsurance balances receivable		8,880		8,970
Reinsurance recoverable on losses and loss expenses		13,769		13,577
Reinsurance recoverable on policy benefits		187		182
Deferred policy acquisition costs		4,406		4,314
Value of business acquired		345		355
Goodwill		15,387		15,332
Other intangible assets		6,674		6,763
Prepaid reinsurance premiums		2,549		2,448
Investments in partially-owned insurance companies		666		666
Other assets		5,582		5,090
Total assets		160,967		159,786
Liabilities
Unpaid losses and loss expenses		60,579		60,540
Unearned premiums		14,857		14,779
Future policy benefits		5,086		5,036
Insurance and reinsurance balances payable		5,797		5,637
Securities lending payable		1,072		1,093
Accounts payable, accrued expenses, and other liabilities		9,073		8,617
Deferred tax liabilities		967		988
Repurchase agreements		1,404		1,403
Short-term debt		300		500
Long-term debt		12,300		12,610
Trust preferred securities		308		308
Total liabilities		111,743		111,511
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 467,223,019 and 465,968,716 shares outstanding)		11,121		11,121
Common Shares in treasury (12,560,845 and 13,815,148 shares)		(1,398)		(1,480)
Additional paid-in capital		14,795		15,335
Retained earnings		24,706		23,613
Accumulated other comprehensive income (loss) (AOCI)		0		(314)
Total shareholders’ equity		49,224		48,275
Total liabilities and shareholders’ equity		$ 160,967		$ 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 March 31, 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 March 31, 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.