Indemnity Supplemental Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed financial statements
Service agreement revenue	$ 8	$ 8	$ 24	$ 24
Total revenues	1,577	1,460	4,574	4,140
Net investment income	109	105	316	326
Net realized gains on investments	191	169	501	358
Net impairment losses recognized in earnings	(9)	0	(10)	0
Equity in earnings of limited partnerships	37	41	112	99
Income (loss) from operations before income taxes and noncontrolling interest	398	270	1,097	734
Provision for income taxes	131	86	363	234
Net income attributable to Indemnity	46	51	127	130
Indemnity
Condensed financial statements
Net investment income	4	4	11	12
Net realized gains on investments	1	2	1	4
Net impairment losses recognized in earnings	0	0	0	0
Income (loss) from operations before income taxes and noncontrolling interest	70	78	193	197
Provision for income taxes	24	27	66	67
Net income attributable to Indemnity	46	51	127	130
Indemnity | Management operations
Condensed financial statements
Management fee revenue, net	333	305	965	882
Service agreement revenue	8	8	23	23
Total revenues	341	313	988	905
Cost of management operations	281	247	820	734
Income (loss) from operations before income taxes and noncontrolling interest	60	66	168	171
Indemnity | Investment operations
Condensed financial statements
Net investment income	4	4	11	12
Net realized gains on investments	1	2	1	4
Net impairment losses recognized in earnings	0	0	0	0
Equity in earnings of limited partnerships	5	6	13	10
Income (loss) from operations before income taxes and noncontrolling interest	$ 10	$ 12	$ 25	$ 26