Indemnity Earnings Per Share (Details) (Indemnity, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Class A
Income available to stockholders (Basic EPS:)
Allocated net income (numerator) (in dollars)	$ 46	$ 36
Weighted shares (denominator) (in shares)	46,402,270	46,774,968
Per-share amount (in dollars per share)	$ 0.99	$ 0.78
Dilutive effect of stock-based awards
Allocated net income (numerator) (in dollars)	0	0
Weighted shares (denominator) (in shares)	95,141	84,397
Assumed conversion of Class B shares
Allocated net income (numerator) (in dollars)	0	1
Weighted shares (denominator) (in shares)	6,100,800	6,100,800
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator) (in dollars)	46	37
Weighted shares (denominator) (in shares)	52,598,211	52,960,165
Per-share amount (in dollars per share)	$ 0.88	$ 0.69
Class B
Reconciliation of the numerators and denominators used in the basic and diluted per-share computations
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)	2400.00%		2400.00%
Income available to stockholders (Basic EPS:)
Allocated net income (numerator) (in dollars)	0	0
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 149.00	$ 117.00
Income available to stockholders on equivalent shares (Diluted EPS:)
Allocated net income (numerator) (in dollars)	$ 0	$ 0
Weighted shares (denominator) (in shares)	2,542	2,542
Per-share amount (in dollars per share)	$ 149.00	$ 117.00