CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 452	$ 400
Other assets	451	456
Indemnity
Fixed maturities, amortized cost	518	437
Equity securities, cost	50	54
Limited partnerships, cost	123	151
Cash and cash equivalents	49	12
Other assets	114	117
Treasury stock (in shares)	21,838,075	21,406,519
Exchange
Fixed maturities, amortized cost	7,801	7,016
Equity securities, cost	778	871
Trading securities, cost	2,198	1,910
Limited partnerships, cost	790	913
Cash and cash equivalents	403	388
Other assets	$ 337	$ 339
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)	68,299,200	68,299,200
Common stock, outstanding (in shares)	46,461,125	46,892,681
Class B | Indemnity
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)	2400.00%	2400.00%
Common stock, stated value per share (in dollars per share)	$ 70	$ 70
Common stock, authorized (in shares)	3,070	3,070
Common stock, issued (in shares)	2,542	2,542
Common stock, outstanding (in shares)	2,542	2,542