Basis of Presentation and Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs and present value of future profits	$ 6,577		$ 6,556	$ 9,900
Deferred income taxes, net	2,375		2,131
Other liabilities (includes variable interest entity liabilities of $461 and $471)	9,728		8,412
Retained earnings	11,042		11,001
Accumulated other comprehensive income, net of tax	1,328		1,251
Total stockholders' equity	21,274	19,447	21,486	18,700
Amortization of deferred policy acquisition costs and present value of future profits	321	450
Insurance operating costs and other expenses	1,312	1,354
Income from continuing operations before income taxes	2	387
Income tax expense (benefit)	(95)	48
Net income	96	501
Net income (loss) available to common shareholders	86	491
Income (loss) from continuing operations, net of tax, available to common shareholders per common share
Basic	$ 0.20	$ 0.74
Diluted	$ 0.19	$ 0.67
Net income available to common shareholders per common share
Basic	$ 0.20	$ 1.10
Diluted	$ 0.18	$ 0.99
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs and present value of future profits			8,744
Deferred income taxes, net			1,398
Other liabilities (includes variable interest entity liabilities of $461 and $471)			8,443
Retained earnings			12,519
Accumulated other comprehensive income, net of tax			1,157
Total stockholders' equity			22,910	20,300
Amortization of deferred policy acquisition costs and present value of future profits		664
Insurance operating costs and other expenses		1,125
Income from continuing operations before income taxes		410
Income tax expense (benefit)		59
Net income		511
Net income (loss) available to common shareholders		501
Income (loss) from continuing operations, net of tax, available to common shareholders per common share
Basic		$ 0.77
Diluted		$ 0.69
Net income available to common shareholders per common share
Basic		$ 1.13
Diluted		$ 1.01
Effect of change [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs and present value of future profits			(2,188)	2,400
Deferred income taxes, net			733
Other liabilities (includes variable interest entity liabilities of $461 and $471)			(31)
Retained earnings			(1,518)
Accumulated other comprehensive income, net of tax			94
Total stockholders' equity			(1,424)	1,600
Amortization of deferred policy acquisition costs and present value of future profits		(214)
Insurance operating costs and other expenses		229
Income from continuing operations before income taxes		(23)
Income tax expense (benefit)		(11)
Net income		(10)
Net income (loss) available to common shareholders		$ (10)
Income (loss) from continuing operations, net of tax, available to common shareholders per common share
Basic		$ (0.03)
Diluted		$ (0.02)
Net income available to common shareholders per common share
Basic		$ (0.03)
Diluted		$ (0.02)