Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $43,660 and $46,005, respectively)	$ 45,930	$ 50,968
Equity securities available-for-sale, at estimated fair value (cost: $388 and $311, respectively)	397	317
Fair value option securities, at estimated fair value	9	9
Mortgage loans (net of valuation allowances of $34 and $35, respectively; includes $2,096 and $2,666, respectively, at estimated fair value, relating to variable interest entities)	8,549	9,157
Policy loans	1,216	1,216
Real estate and real estate joint ventures	733	708
Other limited partnership interests	2,096	1,848
Short-term investments, principally at estimated fair value	2,298	2,576
Other invested assets, principally at estimated fair value	2,224	2,961
Total investments	63,452	69,760
Cash and cash equivalents, principally at estimated fair value	1,211	895
Accrued investment income (includes $11 and $13, respectively, relating to variable interest entities)	603	575
Premiums, reinsurance and other receivables	21,497	22,143
Deferred policy acquisition costs and value of business acquired	4,475	3,793
Current income tax recoverable	193	135
Goodwill	493	559
Other assets	800	822
Separate account assets	94,020	86,114
Total assets	186,744	184,796
Liabilities
Future policy benefits	27,618	27,585
Policyholder account balances	34,350	36,976
Other policy-related balances	3,141	3,138
Payables for collateral under securities loaned and other transactions	7,496	8,399
Long-term debt (includes $1,969 and $2,559, respectively, at estimated fair value, relating to variable interest entities)	2,759	3,350
Deferred income tax liability	1,526	1,938
Other liabilities (includes $10 and $13, respectively, relating to variable interest entities)	6,238	6,547
Separate account liabilities	94,020	86,114
Total liabilities	177,148	174,047
Contingencies, Commitments and Guarantees (Note 10)
Stockholders' Equity
Common stock, par value $2.50 per share; 40,000,000 shares authorized; 34,595,317 shares issued and outstanding at September 30, 2013 and December 31, 2012	86	86
Additional paid-in capital	6,720	6,718
Retained earnings	1,555	1,545
Accumulated other comprehensive income (loss)	1,235	2,400
Total stockholders' equity	9,596	10,749
Total liabilities and stockholders' equity	$ 186,744	$ 184,796