Principles Of Consolidation And Other Matters (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 200,000,000		$ 200,000,000
Effective tax rate	27.60%	28.90%	28.60%	29.50%
Unrecognized tax benefits	105,000,000		105,000,000		128,000,000
Reasonably possible decrease in unrecognized tax benefits, lower bound	0		0
Reasonably possible decrease in unrecognized tax benefits, upper bound	$ 7,000,000		$ 7,000,000