Consolidated Balance Sheets (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Fixed maturities, at fair value (amortized cost, $17,252; $17,278)	$ 19,141	$ 18,983
Equity securities, at fair value (cost, $187; $199)	182	189
Commercial Mortgage Loans	2,010	2,081
Policy loans	1,430	1,438
Other long-term investments	1,473	1,488
Short-term investments	172	163
Total investments	24,408	24,342
Cash and cash equivalents	2,620	1,420
Premiums, accounts and notes receivable, net	3,309	2,757
Reinsurance recoverables	7,098	7,080
Deferred policy acquisition costs	1,554	1,502
Property and equipment	1,486	1,502
Deferred tax assets, net	241	293
Goodwill	6,029	5,989
Other assets, including other intangibles	2,985	2,683
Separate account assets	8,392	8,328
Total assets	58,122	55,896
Liabilities:
Contractholder deposit funds	8,452	8,430
Future policy benefits	9,702	9,642
Unpaid claims and claim expenses	4,581	4,400
Global Health Care medical costs	2,408	2,180
Unearned premiums	634	621
Total insurance and contractholder liabilities	25,777	25,273
Accounts payable, accrued expenses and other liabilities	6,851	6,264
Short-term debt	999	147
Long-term debt	5,062	5,005
Separate account liabilities	8,392	8,328
Total liabilities	47,081	45,017
Contingencies - Note 16
Redeemable noncontrolling interests	83	90
Shareholders' Equity
Common stock (par value per share, $0.25; shares issued, 296; authorized, 600)	74	74
Additional paid-in capital	2,823	2,769
Accumulated other comprehensive loss	(934)	(936)
Retained earnings	10,635	10,289
Less treasury stock, at cost	(1,656)	(1,422)
Total shareholders' equity	10,942	10,774
Noncontrolling interest	16	15
Total equity	10,958	10,789
Total liabilities and equity	$ 58,122	$ 55,896
Shareholders' Equity Per Share	$ 42.46	$ 41.55