Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Securities available for sale, at fair value:
Equity securities (cost $18 in 2013 and $20 in 2012)	$ 24		$ 23
Securities held to maturity, at amortized cost:
Fixed maturities	45,204		54,426
Other investments	167		174
Cash and cash equivalents	2,596		2,041
Total investments and cash	107,400		118,219
Receivables	1,710		976
Accrued investment income	765		842
Deferred policy acquisition costs	9,210		9,658
Property and equipment, at cost less accumulated depreciation	527		564
Other	926	[1]	835	[1]
Total assets	120,538		131,094
Policy liabilities:
Future policy benefits	72,077		76,463
Unpaid policy claims	3,877		4,034
Unearned premiums	11,963		11,904
Other policyholders' funds	5,034		5,319
Total policy liabilities	92,951		97,720
Income taxes	3,799		3,858
Payables for return of cash collateral on loaned securities	207		6,277
Notes payable	4,283		4,352
Other	3,763	[2]	2,909	[2]
Commitments and contingent liabilities (Note 10)
Total liabilities	105,003		115,116
Shareholders' equity:
Common stock of $.10 par value. In thousands: authorized 1,900,000 shares in 2013 and 2012; issued 665,778 shares in 2013 and 665,239 shares in 2012	67		67
Additional paid-in capital	1,532		1,505
Retained earnings	18,114		17,387
Accumulated other comprehensive income (loss):
Unrealized foreign currency translation gains (losses)	(141)		333
Unrealized gains (losses) on investment securities	1,981		2,570
Unrealized gains (losses) on derivatives	(9)		(5)
Pension liability adjustment	(180)		(183)
Treasury stock, at average cost	(5,829)		(5,696)
Total shareholders' equity	15,535		15,978
Total liabilities and shareholders' equity	120,538		131,094
Investments Other Than Consolidated Variable Interest Entities
Securities available for sale, at fair value:
Fixed maturities	50,899		51,466
Perpetual securities	2,678		3,728
Securities held to maturity, at amortized cost:
Fixed maturities	44,938		54,137
Variable Interest Entity, Consolidated
Securities available for sale, at fair value:
Fixed maturities	5,377		5,787
Perpetual securities	455		574
Securities held to maturity, at amortized cost:
Fixed maturities	$ 266		$ 289

[1] Includes $158 in 2013 and $191 in 2012 of derivatives from consolidated variable interest entities

[2] Includes $371 in 2013 and $399 in 2012 of derivatives from consolidated variable interest entities