Basis of Presentation and Accounting Policies (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity	$ 21,961,000,000	$ 21,486,000,000	$ 20,158,000,000	$ 18,700,000,000
Basis of Presentation and Accounting Policies (Textual) [Abstract]
Unrecognized tax benefits	48,000,000
Valuation Allowance	70,000,000	84,000,000
Deferred Taxes Net of Valuation Allowance	1,808,000,000	2,131,000,000
Ordinary deferred tax assets	2,800,000,000
Net deferred tax liability	1,000,000,000
Capital deferred tax assets	1,000,000,000
Gross deferred tax assets realized capital losses	685,000,000
Gross deferred tax liabilities unrealized capital gains	1,700,000,000
Scenario, Previously Reported [Member]
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity		22,910,000,000		20,300,000,000
Basis of Presentation and Accounting Policies (Textual) [Abstract]
Deferred Taxes Net of Valuation Allowance		1,398,000,000
Restatement Adjustment [Member]
Additional Basis of Presentation and Accounting Policies (Textual) [Abstract]
Total stockholders' equity		(1,424,000,000)		1,600,000,000
Basis of Presentation and Accounting Policies (Textual) [Abstract]
Deferred Taxes Net of Valuation Allowance		$ 733,000,000