Consolidated Statements Of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Net premiums written	$ 7,313	$ 7,104
Increase in unearned premiums	(176)	(77)
Net premiums earned	7,137	7,027
Net investment income	836	806
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(13)	(1)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	0
Net OTTI losses recognized in income	(13)	(1)
Net realized gains (losses) excluding OTTI losses	(84)	(1)
Net Realized Gains Losses	(97)	(2)
Total revenues	7,876	7,831
Expenses
Losses and loss expenses	4,098	4,102
Policy benefits	196	151
Policy acquisition costs	1,464	1,464
Administrative expenses	710	692
Interest expense	140	157
Other (income) expense	(39)	(47)
Amortization of purchased intangibles	76	85
Chubb integration expenses	3	10
Total expenses	6,648	6,614
Income before income tax	1,228	1,217
Income tax expense (benefit) (includes $(6) and $(3) on reclassified unrealized losses)	188	135
Net income	1,040	1,082
Other comprehensive income (loss)
Unrealized appreciation (depreciation)	1,845	(1,234)
Reclassification adjustment for net realized (gains) losses included in net income	44	23
Unrealized appreciation (Depreciation) after reclassification adjustment	1,889	(1,211)
Change in:
Cumulative foreign currency translation adjustment	147	397
Postretirement benefit liability adjustment	(27)	(23)
Other comprehensive income (loss), before income tax	2,009	(837)
Income tax (expense) benefit related to OCI items	(331)	208
Other comprehensive income (loss)	1,678	(629)
Comprehensive income	$ 2,718	$ 453
Earnings per share
Basic earnings per share	$ 2.27	$ 2.32
Diluted earnings per share	$ 2.25	$ 2.30