CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Cash and cash equivalents	$ 76	$ 430
Other assets	458	489
Class A | Indemnity
Common stock, stated value per share (in dollars per share)	$ 0.0292	$ 0.0292
Common stock, authorized (in shares)	74,996,930	74,996,930
Common stock, issued (in shares)	68,289,600	68,289,600
Common stock, outstanding (in shares)	48,167,547	50,054,506
Class B | Indemnity
Common stock, convertible at a rate of 2,400 Class A shares for one Class B share (in shares)	2,400	2,400
Common stock, convertible at a rate of 2,400 Class A shares for one Class B share (in shares)	1	1
Common stock, stated value per share (in dollars per share)	$ 70	$ 70
Common stock, authorized (in shares)	2,546	2,546
Common stock, issued (in shares)	2,546	2,546
Common stock, outstanding (in shares)	2,546	2,546
Indemnity
Fixed maturities, amortized cost	507	257
Equity securities, cost	21	20
Trading securities, cost	24	21
Limited partnerships, cost	198	202
Cash and cash equivalents	34	310
Other assets	109	132
Common stock, convertible at a rate of 2,400 Class A shares for one Class B share (in shares)	2,400
Common stock, convertible at a rate of 2,400 Class A shares for one Class B share (in shares)	1
Treasury stock (in shares)	20,122,053	18,235,094
Exchange
Fixed maturities, amortized cost	6,877	6,863
Equity securities, cost	559	503
Trading securities, cost	1,938	1,773
Limited partnerships, cost	1,055	1,083
Cash and cash equivalents	42	120
Other assets	$ 349	$ 357