Condensed Financial Information (Parent Company) (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments:
Available-for-sale Securities, Debt Securities	$ 374,266	$ 350,271
Available-for-sale Securities, Equity Securities	2,891	3,023
Short-term investments, principally at estimated fair value	16,906	17,310
Other Investments	21,145	23,581
Total investments	517,052	511,379
Cash and Cash Equivalents, at Carrying Value	15,738	10,461	12,957	10,024
Accrued Investment Income Receivable	4,374	4,344
Other Assets	7,876	7,984
Total assets	836,781	796,226
Liabilities
Payables for collateral under securities loaned and other transactions	33,687	33,716
Collateral financing arrangements	4,196	4,647
Junior subordinated debt securities	3,192	3,192
Other Liabilities	22,492	30,914
Total liabilities	771,823	738,232
Stockholders' Equity
Preferred stock, par value $0.01 per share; 200,000,000 shares authorized: 84,000,000 shares issued and outstanding; $2,100 aggregate liquidation preference	1	1
Common stock, par value $0.01 per share; 3,000,000,000 shares authorized; 1,094,880,623 and 1,061,150,915 shares issued at December 31, 2012 and 2011, respectively; 1,091,686,736 and 1,057,957,028 shares outstanding at December 31, 2012 and 2011, respectively	11	11
Additional paid-in capital	28,011	26,782
Retained earnings	25,205	24,814
Treasury stock, at cost; 3,193,887 shares at December 31, 2012 and 2011	(172)	(172)
Accumulated other comprehensive income (loss)	11,397	6,083
Total stockholders' equity	64,453	57,519
Total liabilities and stockholders' equity	836,781	796,226
Amortized cost of fixed maturity securities available-for-sale	340,870	329,811
Cost of equity securities available-for-sale	2,838	3,208
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000,000	200,000,000
Preferred stock, shares issued	84,000,000	84,000,000
Preferred stock, shares outstanding	84,000,000	84,000,000
Preferred stock, aggregate liquidation preference	$ 2,100.00	$ 2,100.00
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued	1,094,880,623	1,061,150,915
Common stock, shares outstanding	1,091,686,736	1,057,957,028
Treasury stock, shares	3,193,887	3,193,887
Parent Company [Member]
Investments:
Available-for-sale Securities, Debt Securities	4,967	4,419
Available-for-sale Securities, Equity Securities	13	13
Short-term investments, principally at estimated fair value	295	667
Other Investments	155	275
Total investments	5,430	5,374
Cash and Cash Equivalents, at Carrying Value	188	309
Accrued Investment Income Receivable	37	44
Investment in subsidiaries	81,769	74,281
Loans to subsidiaries and affiliates	750	0
Receivables from subsidiaries	7	165
Other Assets	1,369	1,201
Total assets	89,550	81,374
Liabilities
Payables for collateral under securities loaned and other transactions	0	1,180
Long-term debt - unaffiliated	15,669	15,666
Long-term debt - affiliated	3,250	500
Collateral financing arrangements	2,797	2,797
Junior subordinated debt securities	1,748	1,748
Other Liabilities	1,633	1,964
Total liabilities	25,097	23,855
Stockholders' Equity
Preferred stock, par value $0.01 per share; 200,000,000 shares authorized: 84,000,000 shares issued and outstanding; $2,100 aggregate liquidation preference	1	1
Common stock, par value $0.01 per share; 3,000,000,000 shares authorized; 1,094,880,623 and 1,061,150,915 shares issued at December 31, 2012 and 2011, respectively; 1,091,686,736 and 1,057,957,028 shares outstanding at December 31, 2012 and 2011, respectively	11	11
Additional paid-in capital	28,011	26,782
Retained earnings	25,205	24,814
Treasury stock, at cost; 3,193,887 shares at December 31, 2012 and 2011	(172)	(172)
Accumulated other comprehensive income (loss)	11,397	6,083
Total stockholders' equity	64,453	57,519
Total liabilities and stockholders' equity	89,550	81,374
Amortized cost of fixed maturity securities available-for-sale	4,867	4,350
Cost of equity securities available-for-sale	$ 15	$ 17
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000,000	200,000,000
Preferred stock, shares issued	84,000,000	84,000,000
Preferred stock, shares outstanding	84,000,000	84,000,000
Preferred stock, aggregate liquidation preference	$ 2,100.00	$ 2,100.00
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, shares issued	1,094,880,623	1,061,150,915
Common stock, shares outstanding	1,091,686,736	1,057,957,028
Treasury stock, shares	3,193,887	3,193,887