Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
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	$ 2,900
Gross Unrealized Temporary Loss	4,600	1,700
Gross Unrealized Temporary Loss	1,220	1,455
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in Gross Unrealized Temporary Loss	(42)
Gross Unrealized Temporary Loss	117	159
Gross Unrealized Temporary Loss	48	141
Non-redeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	47	140
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	296
Number of Securities	95
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	165
Number of Securities	64
Percentage of gross unrealized loss	56.00%
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	131
Number of Securities	31
Percentage of gross unrealized loss	44.00%
20% or more [Member] | Twelve months or greater [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	11
Gross Unrealized Temporary Loss	$ 39
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	65.00%