Principles Of Consolidation And Other Matters (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating funds related to regulatory requirements or as collateral under captive insurance arrangements	$ 250,000,000		$ 250,000,000
Effective tax rate	32.10%	26.80%	30.10%	29.20%
Unrecognized tax benefits	133,000,000		133,000,000		117,000,000
Reasonably possible decrease in unrecognized tax benefits	0		0
Projection of unrecognized tax benefit in twelve months, upper bound	$ 20,000,000		$ 20,000,000