Consolidated Balance Sheets (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments [Abstract]
Fixed maturities, at fair value (amortized cost, $17,278; $15,273)	$ 18,983	$ 16,486
Equity securities, at fair value (cost, $199; $146)	189	141
Commercial Mortgage Loans	2,081	2,252
Policy loans	1,438	1,485
Other long-term investments	1,488	1,370
Short-term investments	163	631
Total investments	24,342	22,365
Cash and cash equivalents	1,420	2,795
Premiums, accounts and notes receivable, net	2,757	1,991
Reinsurance recoverables	7,080	7,299
Deferred policy acquisition costs	1,502	1,395
Property and equipment	1,502	1,464
Deferred tax assets, net	293	92
Goodwill	5,989	6,029
Other assets, including other intangibles	2,683	2,654
Separate account assets	8,328	8,252
Total assets	55,896	54,336
Liabilities:
Contractholder deposit funds	8,430	8,470
Future policy benefits	9,642	9,306
Unpaid claims and claim expenses	4,400	4,298
Global Health Care medical claims payable	2,180	2,050
Unearned premiums and fees	621	580
Total insurance and contractholder liabilities	25,273	24,704
Accounts payable, accrued expenses and other liabilities	6,264	5,456
Short-term debt	147	233
Long-term debt, carrying value	5,005	5,014
Separate account liabilities	8,328	8,252
Total liabilities	45,017	43,659
Contingencies - Note 23
Redeemable noncontrolling interest	90	96
Shareholders' Equity
Common stock (par value per share, $0.25; shares issued, 296, 366; authorized, 600)	74	92
Additional paid-in capital	2,769	3,356
Accumulated other comprehensive loss	(936)	(520)
Retained earnings	10,289	13,676
Less treasury stock, at cost	(1,422)	(6,037)
Total shareholders' equity	10,774	10,567
Noncontrolling interest	15	14
Total equity	10,789	10,581
Total liabilities and equity	$ 55,896	$ 54,336
Shareholders' Equity Per Share	$ 41.55	$ 38.35