Consolidated Statements Of Operations and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Net premiums written	$ 4,391	$ 4,130	$ 8,189	$ 7,702
Change in unearned premiums	(324)	(347)	(549)	(538)
Net premiums earned	4,067	3,783	7,640	7,164
Net investment income	534	537	1,065	1,081
Net realized gains (losses):
Other-than-temporary impairment (OTTI) losses gross	(7)	(10)	(10)	(20)
Portion of OTTI losses recognized in other comprehensive income (OCI)	0	0	0	0
Net OTTI losses recognized in income	(7)	(10)	(10)	(20)
Net realized gains (losses) excluding OTTI losses	111	(384)	320	(114)
Total net realized gains (losses)	104	(394)	310	(134)
Total revenues	4,705	3,926	9,015	8,111
Expenses
Losses and loss expenses	2,250	2,119	4,176	3,923
Policy benefits	110	102	241	249
Policy acquisition costs	665	619	1,279	1,201
Administrative expenses	564	514	1,078	1,024
Interest expense	73	62	133	124
Other (income) expense	37	34	27	31
Total expenses	3,699	3,450	6,934	6,552
Income before income tax	1,006	476	2,081	1,559
Income tax expense (includes $7 and $12 Income tax expense from reclassification of unrealized gains in the three and six months ended June 30, 2013, respectively)	115	148	237	258
Net income	891	328	1,844	1,301
Other comprehensive income (loss)
Unrealized (depreciation) appreciation	(1,470)	313	(1,586)	638
Reclassification adjustment for net realized gains included in net income	(38)	(58)	(73)	(91)
Other comprehensive income	(1,508)	255	(1,659)	547
Change in:
Cumulative translation adjustment	(175)	(116)	(386)	(28)
Pension liability	(3)	1	19	(1)
Other comprehensive income (loss), before income tax	(1,686)	140	(2,026)	518
Income tax benefit (expense) related to OCI items	296	(11)	399	(91)
Other comprehensive income (loss)	(1,390)	129	(1,627)	427
Comprehensive income (loss)	$ (499)	$ 457	$ 217	$ 1,728
Earnings per share
Basic earnings per share (US$ per share)	$ 2.61	$ 0.96	$ 5.41	$ 3.83
Diluted earnings per share (US$ per share)	$ 2.59	$ 0.96	$ 5.36	$ 3.80

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