Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $46,427 and $46,005, respectively)	$ 48,963	$ 50,968
Equity securities available-for-sale, at estimated fair value (cost: $399 and $311, respectively)	420	317
Fair value option securities, at estimated fair value	9	9
Mortgage loans (net of valuation allowances of $34 and $35, respectively; includes $2,268 and $2,666, respectively, at estimated fair value, relating to variable interest entities)	8,609	9,157
Policy loans	1,213	1,216
Real estate and real estate joint ventures	742	708
Other limited partnership interests	2,049	1,848
Short-term investments, principally at estimated fair value	2,112	2,576
Other invested assets, principally at estimated fair value	2,310	2,961
Total investments	66,427	69,760
Cash and cash equivalents, principally at estimated fair value	727	895
Accrued investment income (includes $10 and $13, respectively, relating to variable interest entities)	570	575
Premiums, reinsurance and other receivables	21,448	22,143
Deferred policy acquisition costs and value of business acquired	4,358	3,793
Current income tax recoverable	213	135
Goodwill	559	559
Other assets	797	822
Separate account assets	90,066	86,114
Total assets	185,165	184,796
Liabilities
Future policy benefits	27,221	27,585
Policyholder account balances	35,757	36,976
Other policy-related balances	3,182	3,138
Payables for collateral under securities loaned and other transactions	8,634	8,399
Long-term debt (includes $2,148 and $2,559, respectively, at estimated fair value, relating to variable interest entities)	2,939	3,350
Deferred income tax liability	1,543	1,938
Other liabilities (includes $11 and $13, respectively, relating to variable interest entities)	6,298	6,547
Separate account liabilities	90,066	86,114
Total liabilities	175,640	174,047
Contingencies, Commitments and Guarantees (Note 9)
Stockholders' Equity
Common stock, par value $2.50 per share; 40,000,000 shares authorized; 34,595,317 shares issued and outstanding at June 30, 2013 and December 31, 2012	86	86
Additional paid-in capital	6,720	6,718
Retained earnings	1,447	1,545
Accumulated other comprehensive income (loss)	1,272	2,400
Total stockholders' equity	9,525	10,749
Total liabilities and stockholders' equity	$ 185,165	$ 184,796