Investments (Select Information For Securities In A Gross Unrealized Loss Position) (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 Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	$ 78,903	$ 77,217
Fair Value	86,365	80,976
AFS Securities Backed By Pools Of Residential Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	903	1,261
Fair Value	829	1,146
Gross Unrealized Losses	74	115
AFS Securities Backed By Pools Of Commercial Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	164	193
Fair Value	147	169
Gross Unrealized Losses	17	24
Total AFS Securities Backed By Pools Of Residential And Commercial Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	1,067	1,454
Fair Value	976	1,315
Gross Unrealized Losses	91	139
AFS Securities Subject To Detailed Analysis Backed By Pools Of Residential Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	771	933
Fair Value	702	833
Gross Unrealized Losses	70	100
AFS Securities Subject To Detailed Analysis Backed By Pools Of Commercial Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	29	29
Fair Value	25	24
Gross Unrealized Losses	4	5
AFS Securities Subject To Detailed Analysis Backed By Pools Of Residential And Commercial Mortgages [Member]
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	800	962
Fair Value	727	857
Gross Unrealized Losses	$ 74	$ 105