Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net premiums written	$ 8,343	$ 8,015	$ 15,656	$ 15,119
Increase in unearned premiums	(452)	(351)	(628)	(428)
Net premiums earned	7,891	7,664	15,028	14,691
Net investment income	859	828	1,695	1,634
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(14)	(4)	(27)	(5)
Portion of OTTI losses recognized in other comprehensive income (OCI)	1	0	1	0
Net OTTI losses recognized in income	(13)	(4)	(26)	(5)
Net realized gains (losses) excluding OTTI losses	(210)	22	(294)	21
Net Realized Gains Losses	(223)	18	(320)	16
Total revenues	8,527	8,510	16,403	16,341
Expenses
Losses and loss expenses	4,715	4,487	8,813	8,589
Policy benefits	161	150	357	301
Policy acquisition costs	1,544	1,464	3,008	2,928
Administrative expenses	758	747	1,468	1,439
Interest expense	140	167	280	324
Other (income) expense	(230)	(115)	(269)	(162)
Amortization of purchased intangibles	77	85	153	170
Chubb integration expenses	4	13	7	23
Total expenses	7,169	6,998	13,817	13,612
Income before income tax	1,358	1,512	2,586	2,729
Income tax expense (benefit) (includes $4, $(12), $(2) and $(15) on reclassified unrealized gains and losses)	208	218	396	353
Net income	1,150	1,294	2,190	2,376
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	1,252	(578)	3,097	(1,812)
Reclassification adjustment for net realized (gains) losses included in net income	(12)	81	32	104
Unrealized appreciation (Depreciation) after reclassification adjustment	1,240	(497)	3,129	(1,708)
Change in:
Cumulative foreign currency translation adjustment	(97)	(574)	50	(177)
Postretirement benefit liability adjustment	(18)	(17)	(45)	(40)
Other comprehensive income (loss), before income tax	1,125	(1,088)	3,134	(1,925)
Income tax (expense) benefit related to OCI items	(216)	71	(547)	279
Other comprehensive income (loss)	909	(1,017)	2,587	(1,646)
Comprehensive income	$ 2,059	$ 277	$ 4,777	$ 730
Earnings per share
Basic earnings per share	$ 2.52	$ 2.78	$ 4.78	$ 5.10
Diluted earnings per share	$ 2.50	$ 2.76	$ 4.75	$ 5.07

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