CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Revenues
Premiums earned	$ 1,087	$ 1,030
Net investment income	108	105
Net realized investment gains	296	149
Net impairment losses recognized in earnings	0	0
Equity in earnings of limited partnerships	21	72
Other income	8	9
Total revenues	1,520	1,365
Benefits and expenses
Insurance losses and loss expenses	716	706
Policy acquisition and underwriting expenses	270	247
Total benefits and expenses	986	953
Income from operations before income taxes and noncontrolling interest	534	412
Provision for income taxes	180	138
Net income	354	274	268
Less: Net income attributable to noncontrolling interest in consolidated entity - Exchange	318	230
Net income attributable to Indemnity	36	44
Indemnity
Revenues
Net investment income	4	4
Net realized investment gains	3	1
Benefits and expenses
Income from operations before income taxes and noncontrolling interest	54	67
Provision for income taxes	18	23
Net income			169
Net income attributable to Indemnity	$ 36	$ 44
Class A | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 0.76	$ 0.88
Common stock - diluted (in dollars per share)	$ 0.67	$ 0.78
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	47,749,799	49,789,056
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	53,930,044	55,968,838
Dividends declared per share
Common stock (in dollars per share)	$ 0.5525	$ 0.515	$ 2.0975
Class B | Indemnity
Net income attributable to Indemnity per share
Common stock - basic (in dollars per share)	$ 113.56	$ 126.48
Common stock - diluted (in dollars per share)	$ 113.56	$ 126.48
Weighted average shares outstanding attributable to Indemnity - Basic
Common stock - basic (in shares)	2,545	2,546
Weighted average shares outstanding attributable to Indemnity - Diluted
Common stock - diluted (in shares)	2,545	2,546
Dividends declared per share
Common stock (in dollars per share)	$ 82.875	$ 77.25	$ 314.6250