Consolidated Balance Sheets (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments [Abstract]
Fixed maturities, at fair value (amortized cost, $16,598; $15,273)	$ 18,321	$ 16,486
Equity securities, at fair value (cost, $136; $146)	131	141
Commercial Mortgage Loans	2,217	2,252
Policy loans	1,453	1,485
Real estate	62	97
Other long-term investments	1,336	1,273
Short-term investments	232	631
Total investments	23,752	22,365
Cash and cash equivalents	1,967	2,795
Accrued investment income	245	247
Premiums, accounts and notes receivable, net	2,657	1,991
Reinsurance recoverables	7,132	7,299
Deferred policy acquisition costs	1,510	1,395
Property and equipment	1,498	1,464
Deferred tax assets, net		92
Goodwill	6,033	6,029
Other assets, including other intangibles	2,492	2,407
Separate account assets	8,643	8,252
Total assets	55,929	54,336
Liabilities:
Contractholder deposit funds	8,459	8,470
Future policy benefits	9,583	9,306
Unpaid claims and claim expenses	4,389	4,298
Global Health Care medical claims payable	2,276	2,050
Unearned premiums and fees	625	580
Total insurance and contractholder liabilities	25,332	24,704
Accounts payable, accrued expenses and other liabilities	5,726	5,456
Short-term debt	121	233
Long-term debt	5,022	5,014
Deferred tax liabilities, net	34	0
Separate account liabilities	8,643	8,252
Total liabilities	44,878	43,659
Contingencies - Note 16
Redeemable noncontrolling interest	99	96
Shareholders' Equity
Common stock (par value per share, $0.25; shares issued,366; authorized, 600)	92	92
Additional paid-in capital	3,405	3,356
Net unrealized appreciation, fixed maturities	663	473
Net unrealized appreciation, equity securities	3	4
Net unrealized depreciation, derivatives	(19)	(19)
Net translation of foreign currencies	117	82
Postretirement benefits liability adjustment	(1,037)	(1,060)
Accumulated other comprehensive loss	(273)	(520)
Retained earnings	14,677	13,676
Less treasury stock, at cost	(6,964)	(6,037)
Total shareholders' equity	10,937	10,567
Noncontrolling interest	15	14
Total equity	10,952	10,581
Total liabilities and equity	$ 55,929	$ 54,336
Shareholders' Equity Per Share	$ 41.32	$ 38.35