Shareholders' Equity And Dividend Restrictions (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shareholders Equity And Dividend Restrictions [Abstract]
Declared cash dividends, per share	$ 1.76	$ 1.655	$ 1.62
Dividends declared by insurance subsidiary to parent	$ 400	$ 375	$ 300
Dividend payment without prior regulatory approval, Minimum percent of policyholder surplus	10.00%
Dividend payment without prior regulatory approval, percent of statutory net income for the prior calendar year	100.00%
Dividends might be paid during 2015	$ 447