Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Equity securities available-for-sale with gross unrealized loss of equal to or greater than stated percentage	20.00%
Fixed maturity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in Gross Unrealized Temporary Loss	$ 3,000
Gross Unrealized Temporary Loss	1,600	4,600
Gross Unrealized Temporary Loss	1,267	1,220
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in Gross Unrealized Temporary Loss	(73)
Gross Unrealized Temporary Loss	44	117
Gross Unrealized Temporary Loss	38	48
Non-redeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	38	47
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	236
Number of Securities	68
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	143
Number of Securities	44
Percentage of gross unrealized loss	61.00%
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member] | Below Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	93
Number of Securities	24
Percentage of gross unrealized loss	39.00%
20% or more [Member] | Twelve months or greater [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	9
Gross Unrealized Temporary Loss	$ 27
20% or more [Member] | Twelve months or greater [Member] | Non-redeemable preferred stock [Member] | Aaa/Aa/A [Member] | Financial Services Industry [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of gross unrealized loss	59.00%