Indemnity Supplemental Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed financial statements
Service agreement revenue	$ 8	$ 8
Total revenues	1,571	1,520
Net investment income	103	108
Net realized gains on investments	249	296
Net impairment losses recognized in earnings	0	0
Equity in earnings of limited partnerships	36	21
Income (loss) from operations before income taxes and noncontrolling interest	436	534
Net income attributable to Indemnity	37	36
Indemnity
Condensed financial statements
Net investment income	4	4
Net realized gains on investments	0	3
Net impairment losses recognized in earnings	0	0
Income (loss) from operations before income taxes and noncontrolling interest	56	54
Provision for income taxes	19	18
Net income attributable to Indemnity	37	36
Indemnity | Management operations
Condensed financial statements
Management fee revenue, net	296	269
Service agreement revenue	7	7
Total revenues	303	276
Cost of management operations	254	230
Income (loss) from operations before income taxes and noncontrolling interest	49	46
Indemnity | Investment operations
Condensed financial statements
Net investment income	4	4
Net realized gains on investments	0	3
Net impairment losses recognized in earnings	0	0
Equity in earnings of limited partnerships	3	1
Income (loss) from operations before income taxes and noncontrolling interest	$ 7	$ 8