Investments (Fair Values And Unrealized Losses By Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	$ 1,516	$ 223
Less than 12 months Unrealized Losses	74	12
12 months or more Fair Value	86	17
12 months or more Unrealized Losses	5	1
Total Fair Value	1,602	240
Total Unrealized Losses	79	13
Fixed Maturities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1,397	112
Less than 12 months Unrealized Losses	70	2
12 months or more Fair Value	86	17
12 months or more Unrealized Losses	5	1	5
Total Fair Value	1,483	129
Total Unrealized Losses	75	3
Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	490	53
Less than 12 months Unrealized Losses	18	1
12 months or more Fair Value	42	0
12 months or more Unrealized Losses	3	0
Total Fair Value	532	53
Total Unrealized Losses	21	1
Fixed Maturities [Member] | United States Government [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	1
Less than 12 months Unrealized Losses	0
12 months or more Fair Value	0
12 months or more Unrealized Losses	0
Total Fair Value	1
Total Unrealized Losses	0
Fixed Maturities [Member] | Government-Sponsored Enterprises [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	199	1
Less than 12 months Unrealized Losses	27	0
12 months or more Fair Value	1	0
12 months or more Unrealized Losses	0	0
Total Fair Value	200	1
Total Unrealized Losses	27	0
Fixed Maturities [Member] | Foreign Government [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	10
Less than 12 months Unrealized Losses	0
12 months or more Fair Value	0
12 months or more Unrealized Losses	0
Total Fair Value	10
Total Unrealized Losses	0
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	125
Less than 12 months Unrealized Losses	5
12 months or more Fair Value	0
12 months or more Unrealized Losses	0
Total Fair Value	125
Total Unrealized Losses	5
Fixed Maturities [Member] | Corporate Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	572	58
Less than 12 months Unrealized Losses	20	1
12 months or more Fair Value	43	17
12 months or more Unrealized Losses	2	1
Total Fair Value	615	75
Total Unrealized Losses	22	2
Equity Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	119	111
Less than 12 months Unrealized Losses	4	10
12 months or more Fair Value	0	0
12 months or more Unrealized Losses	0	0
Total Fair Value	119	111
Total Unrealized Losses	4	10
Equity Securities [Member] | Common Stock [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	77	107
Less than 12 months Unrealized Losses	1	9
12 months or more Fair Value	0	0
12 months or more Unrealized Losses	0	0
Total Fair Value	77	107
Total Unrealized Losses	1	9
Equity Securities [Member] | Preferred Stock [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 months Fair Value	42	4
Less than 12 months Unrealized Losses	3	1
12 months or more Fair Value	0	0
12 months or more Unrealized Losses	0	0
Total Fair Value	42	4
Total Unrealized Losses	$ 3	$ 1