Consolidated Balance Sheets (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Fixed maturities, at fair value (amortized cost, $16,156; $15,273)	$ 17,650	$ 16,486
Equity securities, at fair value (cost, $133; $146)	127	141
Commercial Mortgage Loans	2,125	2,252
Policy loans	1,460	1,485
Real estate	57	97
Other long-term investments	1,292	1,273
Short-term investments	394	631
Total investments	23,105	22,365
Cash and cash equivalents	2,276	2,795
Accrued investment income	284	247
Premiums, accounts and notes receivable, net	2,432	1,991
Reinsurance recoverables	7,213	7,299
Deferred policy acquisition costs	1,438	1,395
Property and equipment	1,450	1,464
Deferred income taxes, net	27	92
Goodwill	6,030	6,029
Other assets, including other intangibles	2,530	2,407
Separate account assets	8,388	8,252
Total assets	55,173	54,336
Liabilities:
Contractholder deposit funds	8,498	8,470
Future policy benefits	9,414	9,306
Unpaid claims and claim expenses	4,397	4,298
Global Health Care medical claims payable	2,151	2,050
Unearned premiums and fees	637	580
Total insurance and contractholder liabilities	25,097	24,704
Accounts payable, accrued expenses and other liabilities	5,791	5,456
Short-term debt	210	233
Long-term debt	5,022	5,014
Separate account liabilities	8,388	8,252
Total liabilities	44,508	43,659
Contingencies - Note 16
Redeemable noncontrolling interest	96	96
Shareholders' Equity
Common stock (par value per share, $0.25; shares issued,366; authorized, 600)	92	92
Additional paid-in capital	3,392	3,356
Net unrealized appreciation, fixed maturities	560	473
Net unrealized appreciation, equity securities	3	4
Net unrealized depreciation, derivatives	(19)	(19)
Net translation of foreign currencies	71	82
Postretirement benefits liability adjustment	(1,048)	(1,060)
Accumulated other comprehensive loss	(433)	(520)
Retained earnings	14,136	13,676
Less treasury stock, at cost	(6,631)	(6,037)
Total shareholders' equity	10,556	10,567
Noncontrolling interest	13	14
Total equity	10,569	10,581
Total liabilities and equity	$ 55,173	$ 54,336
Shareholders' Equity Per Share	$ 39.28	$ 38.35