Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Securities available for sale, at fair value:
Equity securities (cost $20 in 2012 and $22 in 2011)	$ 23		$ 25
Securities held to maturity, at amortized cost:
Other investments	174		168
Cash and cash equivalents	2,041		2,249
Total investments and cash	118,219		103,462
Receivables	976		680
Accrued investment income	842		802
Deferred policy acquisition costs	9,658		9,789
Property and equipment, at cost less accumulated depreciation	564		617
Other	835	[1]	887	[1]
Total assets	131,094		116,237
Policy liabilities:
Future policy benefits	76,463		79,278
Unpaid policy claims	4,034		3,981
Unearned premiums	2,158		1,704
Other policyholders' funds	15,294		9,630
Total policy liabilities	97,949		94,593
Income taxes	3,858		2,308
Payables for return of cash collateral on loaned securities	6,277		838
Notes payable	4,352		3,285
Other	2,680	[2]	2,267	[2]
Commitments and contingent liabilities (Note 14)
Total liabilities	115,116		103,291
Shareholders' equity:
Common stock of $.10 par value. In thousands: authorized 1,900,000 shares in 2012 and 2011; issued 665,239 shares in 2012 and 663,639 shares in 2011	67		66
Additional paid-in capital	1,505		1,408
Retained earnings	17,387		15,148
Accumulated other comprehensive income (loss):
Unrealized foreign currency translation gains	333		984
Unrealized gains (losses) on investment securities	2,570		1,143
Unrealized gains (losses) on derivatives	(5)		9
Pension liability adjustment	(183)		(171)
Treasury stock, at average cost	(5,696)		(5,641)
Total shareholders' equity	15,978		12,946
Total liabilities and shareholders' equity	131,094		116,237
Investments Other Than Consolidated Variable Interest Entities
Securities available for sale, at fair value:
Fixed maturities	51,466		42,222
Perpetual securities	3,728		5,149
Securities held to maturity, at amortized cost:
Fixed maturities	54,137		46,366
Variable Interest Entity, Consolidated
Securities available for sale, at fair value:
Fixed maturities	5,787		5,350
Perpetual securities	574		1,290
Securities held to maturity, at amortized cost:
Fixed maturities	$ 289		$ 643

[1] Includes $191 in 2012 and $375 in 2011 of derivatives from consolidated variable interest entities

[2] Includes $399 in 2012 and $531 in 2011 of derivatives from consolidated variable interest entities