CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Revenues
Premiums earned	$ 1,215	$ 1,109	$ 2,390	$ 2,196
Net investment income	104	113	207	221
Net realized investment gains (losses)	61	(107)	310	189
Net impairment losses recognized in earnings	(1.0)	0	(1.0)	0
Equity in earnings of limited partnerships	39	37	75	58
Other income	8	8	16	16
Total revenues	1,426	1,160	2,997	2,680
Benefits and expenses
Insurance losses and loss expenses	861	943	1,703	1,659
Policy acquisition and underwriting expenses	302	287	595	557
Total benefits and expenses	1,163	1,230	2,298	2,216
Income (loss) from operations before income taxes and noncontrolling interest	263	(70)	699	464
Provision for income taxes	86	(32)	232	148
Net income (loss)	177	(38)	467	316	619
Less: Net income (loss) attributable to noncontrolling interest in consolidated entity – Exchange	133	(81)	386	237
Net income attributable to Indemnity	44	43	81	79
Indemnity
Revenues
Net investment income	3	4	7	8
Net realized investment gains (losses)	0	(1)	0	2
Net impairment losses recognized in earnings	(0.1)	0	(0.1)	0
Benefits and expenses
Income (loss) from operations before income taxes and noncontrolling interest	67	65	123	119
Net income (loss)			81		160
Net income attributable to Indemnity	$ 44	$ 43	$ 81	$ 79
Class A | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 0.95	$ 0.90	$ 1.73	$ 1.65
Common stock - diluted (in dollars per share)	$ 0.84	$ 0.80	$ 1.54	$ 1.47
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	46,693,333	47,492,305	46,733,925	47,619,852
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	52,886,259	53,677,848	52,926,851	53,807,795
Dividends declared per share
Common stock (in dollars per share)	$ 0.5925	$ 0.5525	$ 1.185	$ 1.105	$ 4.25
Class B | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 142.00	$ 135.00	$ 259.00	$ 249.00
Common stock - diluted (in dollars per share)	$ 142.00	$ 135.00	$ 259.00	$ 249.00
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	2,542	2,544	2,542	2,545
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	2,542	2,544	2,542	2,545
Dividends declared per share
Common stock (in dollars per share)	$ 88.8750	$ 82.8750	$ 177.7500	$ 165.7500	$ 637.5000