Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Assets
Fixed maturities available for sale, at fair value (amortized cost – $XX,XXX and $77,835)(includes hybrid financial instruments of $X and $5)		$ 79,111		$ 78,939
Fixed maturities held to maturity, at amortized cost (fair value – $14,122 and $14,474)		14,253		14,335
Equity securities, at fair value (cost – $948 and $737)		948		937
Short-term investments, at fair value and amortized cost		2,874		3,561
Other investments (cost – $4,919 and $4,417)		4,919		4,672
Total investments		102,105		102,444
Cash		1,988	[1]	728	[2]
Restricted Cash	[1]	125		123
Securities lending collateral		2,039		1,737
Accrued investment income		895		909
Insurance and reinsurance balances receivable		9,570		9,334
Reinsurance Recoverable Losses And Loss Expenses		14,982		15,034
Reinsurance recoverable on policy benefits		181		184
Deferred policy acquisition costs		4,843		4,723
Value of business acquired		321		326
Goodwill		15,686		15,541
Other intangible assets		6,437		6,513
Prepaid reinsurance premiums		2,600		2,529
Investments in partially-owned insurance companies		664		662
Other assets		6,345		6,235
Total assets		168,781		167,022
Liabilities
Unpaid losses and loss expenses		63,139		63,179		$ 60,540
Unearned premiums		15,495		15,216
Future policy benefits		5,412		5,321
Insurance and reinsurance balances payable		6,148		5,868
Securities lending payable		2,039		1,737
Accounts payable, accrued expenses, and other liabilities		8,618		9,545
Deferred tax liabilities		468		699
Repurchase agreements		1,412		1,408
Short-term debt		1,669		1,013
Long-term debt		12,786		11,556
Trust preferred securities		308		308
Total liabilities		117,494		115,850
Commitments and contingencies
Shareholders’ equity
Common Shares (CHF 24.15 par value; 479,783,864 shares issued; 465,831,486 and 463,833,179 shares outstanding)		11,121		11,121
Common Shares in treasury (13,952,378 and 15,950,685 shares)		(1,727)		(1,944)
Additional Paid in Capital, Common Stock		13,430		13,978
Retained earnings		28,965		27,474
Accumulated other comprehensive income (loss) (AOCI)		(502)		543
Total shareholders’ equity		51,287		51,172
Total liabilities and shareholders’ equity		$ 168,781		$ 167,022

[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, 2018, 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 December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.