CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Revenues
Premiums earned	$ 1,355	$ 1,241	$ 3,962	$ 3,631
Net investment income	115	109	335	316
Net realized investment (losses) gains	(85)	191	104	501
Net impairment losses recognized in earnings	(1)	(9)	(1)	(10)
Equity in earnings of limited partnerships	34	37	111	112
Other income	8	8	24	24
Total revenues	1,426	1,577	4,535	4,574
Benefits and expenses
Insurance losses and loss expenses	935	868	3,095	2,571
Policy acquisition and underwriting expenses	341	311	987	906
Total benefits and expenses	1,276	1,179	4,082	3,477
Income (loss) from operations before income taxes and noncontrolling interest	150	398	453	1,097
Provision for income taxes	42	131	133	363
Net income (loss)	108	267	320	734	1,048
Less: Net income attributable to noncontrolling interest in consolidated entity – Exchange	61	221	178	607
Net income attributable to Indemnity	47	46	142	127
Indemnity
Revenues
Net investment income	4	4	12	11
Net realized investment (losses) gains	0	1	1	1
Net impairment losses recognized in earnings	0	0	0	0
Equity in earnings of limited partnerships	4	5	13	13
Benefits and expenses
Income (loss) from operations before income taxes and noncontrolling interest	70	70	214	193
Provision for income taxes	23	24	72	66
Net income (loss)			142		163
Net income attributable to Indemnity	$ 47	$ 46	$ 142	$ 127
Class A | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 1.01	$ 0.98	$ 3.05	$ 2.71
Common stock - diluted (in dollars per share)	$ 0.90	$ 0.87	$ 2.71	$ 2.41
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	46,189,068	46,656,911	46,267,694	46,707,971
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	52,387,164	52,851,250	52,465,790	52,902,310
Dividends declared per share
Common stock (in dollars per share)	$ 0.6350	$ 0.5925	$ 1.9050	$ 1.7775	$ 2.4125
Class B | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 151.00	$ 147.00	$ 458.00	$ 406.00
Common stock - diluted (in dollars per share)	$ 151.00	$ 147.00	$ 457.00	$ 406.00
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	2,542	2,542	2,542	2,542
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	2,542	2,542	2,542	2,542
Dividends declared per share
Common stock (in dollars per share)	$ 95.2500	$ 88.8750	$ 285.7500	$ 266.6250	$ 361.8750