Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Net premiums written	$ 8,015	$ 7,581	$ 15,119	$ 14,291
Change In Unearned Premium Net	(351)	(344)	(428)	(282)
Net premiums earned	7,664	7,237	14,691	14,009
Net investment income	828	770	1,634	1,515
Net Realized Gains Losses [Abstract]
Other-than-temporary impairment (OTTI) losses gross	(4)	(9)	(5)	(28)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	1	0	1
Net OTTI losses recognized in income	(4)	(8)	(5)	(27)
Net realized gains (losses) excluding OTTI losses	22	109	21	121
Total net realized gains (losses) (includes $(81), $25, $(104) and $17 reclassified from AOCI)	18	101	16	94
Total revenues	8,510	8,108	16,341	15,618
Expenses
Losses and loss expenses	4,487	4,146	8,589	7,935
Policy benefits	150	163	301	331
Policy acquisition costs	1,464	1,449	2,928	2,846
Administrative expenses	747	706	1,439	1,382
Interest expense	167	147	324	301
Other (income) expense	(115)	(145)	(162)	(215)
Amortization of purchased intangibles	85	65	170	129
Chubb integration expenses	13	72	23	183
Total expenses	6,998	6,603	13,612	12,892
Income before income tax	1,512	1,505	2,729	2,726
Income tax expense (benefit) (includes $(12), $9, $(15) and $3 on reclassified unrealized gains and losses)	218	200	353	328
Net income	1,294	1,305	2,376	2,398
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	(578)	459	(1,812)	766
Reclassification adjustment for net realized (gains) losses included in net income	81	(25)	104	(17)
Unrealized appreciation (Depreciation) after reclassification adjustment	(497)	434	(1,708)	749
Change in:
Cumulative foreign currency translation adjustment	(574)	102	(177)	236
Postretirement benefit liability adjustment	(17)	(35)	(40)	(55)
Other comprehensive income (loss), before income tax	(1,088)	501	(1,925)	930
Income tax (expense) benefit related to OCI items	71	(131)	279	(246)
Other comprehensive income (loss)	(1,017)	370	(1,646)	684
Comprehensive income	$ 277	$ 1,675	$ 730	$ 3,082
Earnings per share
Basic earnings per share	$ 2.78	$ 2.79	$ 5.10	$ 5.12
Diluted earnings per share	$ 2.76	$ 2.77	$ 5.07	$ 5.08

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Change during the period in the unearned portion of gross premiums written (direct and assumed) and ceded premiums written, excluding the portion amortized into income.

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Net realized gains (losses) [Abstract].

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The net amount of operating interest income (expense).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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