Income Taxes (Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 250	$ 198	$ 61
Tax at statutory rate, percentage	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	(32)	(33)	(35)
Dividend received exclusion	(26)	(24)	(20)
Other	5	4	3
Total provision for income taxes	$ 197	$ 145	$ 9
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds, percentage	(4.50%)	(5.90%)	(20.00%)
Dividend received exclusion, percentage	(3.60%)	(4.20%)	(11.70%)
Other, percentage	0.70%	0.70%	1.90%
Effective tax, percentage	27.60%	25.60%	5.20%