Basis of Presentation and Accounting Policies (Details Textual) (USD $)	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity	$ 21,274,000,000	$ 21,486,000,000	$ 19,447,000,000	$ 18,700,000,000
Basis of Presentation and Accounting Policies (Textual) [Abstract]
Unrecognized tax benefits	48,000,000
Valuation Allowance	75,000,000	95,000,000
Deferred income taxes	2,400,000,000
Ordinary deferred tax assets	2,900,000,000
Net deferred tax liability	482,000,000
Capital deferred tax assets	482,000,000
Gross deferred tax assets realized capital losses	682,000,000
Gross deferred tax liabilities unrealized capital gains	1,200,000,000
Scenario, Previously Reported [Member]
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity		22,910,000,000		20,300,000,000
Restatement Adjustment [Member]
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity		$ (1,424,000,000)		$ 1,600,000,000