CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fixed maturities, amortized cost	$ 9,499
Cash and cash equivalents	420	514
Other assets	528	501
Indemnity
Fixed maturities, amortized cost	545	555
Equity securities, cost	24	24
Limited partnerships, cost	86	89
Cash and cash equivalents	58	92
Other assets	125	127
Treasury stock (in shares)	22,110,132	22,110,132
Exchange
Fixed maturities, amortized cost	8,954	8,540
Equity securities, cost	763	788
Trading securities, cost	2,218	2,289
Limited partnerships, cost	679	694
Cash and cash equivalents	362	422
Other assets	$ 403	$ 374
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)	46,189,068	46,189,068
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