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Earnings Per Share (Details) (Indemnity, USD $)
In Millions, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Indemnity Earnings Per Share Calculation     
Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1 (in shares)2,400 2,400  
Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1 (in shares)1 1  
Class A
     
Income available to stockholders     
Allocated net income (numerator) (in dollars)$ 47$ 54$ 142$ 149 
Weighted shares (denominator) (in shares)48,503,38350,499,55149,176,12450,897,035 
Per-share amount (in dollars per share)$ 0.97$ 1.05$ 2.90$ 2.92 
Dilutive effect of stock awards     
Allocated net income (numerator) (in dollars)0000 
Weighted shares (denominator) (in shares)71,23868,37071,23868,370 
Assumed conversion of Class B shares     
Allocated net income (numerator) (in dollars)0011 
Weighted shares (denominator) (in shares)6,110,4006,110,4006,110,4006,110,400 
Income available to stockholders on equivalent shares     
Allocated net income (numerator) (in dollars)4754143150 
Weighted shares (denominator) (in shares)54,685,02156,678,32155,357,76257,075,805 
Per-share amount (in dollars per share)$ 0.87$ 0.94$ 2.59$ 2.62 
Class A | Other stock-based awards
     
Income available to stockholders on equivalent shares     
Dilutive effect of stock awards not yet vested (in shares) 6,400 6,400 
Class A | Stock compensation plan for outside directors
     
Income available to stockholders on equivalent shares     
Dilutive effect of stock awards not yet vested (in shares)5,4867,9595,4867,959 
Dilutive effect of vested stock awards (in shares)65,75254,01165,75254,011 
Class B
     
Indemnity Earnings Per Share Calculation     
Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1 (in shares)2,400 2,400 2,400
Class B shares are convertible into Class A shares at a conversion ratio of 2,400 to 1 (in shares)1 1 1
Income available to stockholders     
Allocated net income (numerator) (in dollars)0011 
Weighted shares (denominator) (in shares)2,5462,5462,5462,546 
Per-share amount (in dollars per share)$ 146.67$ 150.87$ 439.39$ 421.91 
Income available to stockholders on equivalent shares     
Allocated net income (numerator) (in dollars)$ 0$ 0$ 1$ 1 
Weighted shares (denominator) (in shares)2,5462,5462,5462,546 
Per-share amount (in dollars per share)$ 146.67$ 150.87$ 439.39$ 421.91