Investments (Select Information For Securities In A Gross Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities Residential And Commercial Mortgage At Risk [Line Items]
Amortized cost	$ 78,032	$ 77,217
Fair Value	83,792	80,976
Gross Unrealized Losses	658	1,265
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	1,135	1,261
Fair Value	1,046	1,146
Gross Unrealized Losses	89	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	211	193
Fair Value	191	169
Gross Unrealized Losses	20	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	1,346	1,454
Fair Value	1,237	1,315
Gross Unrealized Losses	109	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	806	933
Fair Value	726	833
Gross Unrealized Losses	80	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	835	962
Fair Value	751	857
Gross Unrealized Losses	$ 84	$ 105

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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