Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Fixed maturities, at fair value (amortized cost, $18,456; $17,278)	$ 19,455	$ 18,983
Equity securities, at fair value (cost, $190; $199)	190	189
Commercial Mortgage Loans	1,864	2,081
Policy loans	1,419	1,438
Other long-term investments	1,404	1,488
Short-term investments	381	163
Total investments	24,713	24,342
Cash and cash equivalents	1,968	1,420
Premiums, accounts and notes receivable, net	3,694	2,757
Reinsurance recoverables	6,813	7,080
Deferred policy acquisition costs	1,659	1,502
Property and equipment	1,534	1,502
Deferred tax assets, net	379	293
Goodwill	6,019	5,989
Other assets, including other intangibles	2,476	2,657
Separate account assets	7,833	8,328
Total assets	57,088	55,870
Liabilities:
Contractholder deposit funds	8,443	8,430
Future policy benefits	9,479	9,642
Unpaid claims and claim expenses	4,574	4,400
Global Health Care medical costs	2,355	2,180
Unearned premiums	629	621
Total insurance and contractholder liabilities	25,480	25,273
Accounts payable, accrued expenses and other liabilities	6,493	6,264
Short-term debt	149	147
Long-term debt	5,020	4,979
Separate account liabilities	7,833	8,328
Total liabilities	$ 44,975	$ 44,991
Contingencies - Note 23
Redeemable noncontrolling interests	$ 69	$ 90
Shareholders' Equity
Common stock (par value per share, $0.25; shares issued, 296; authorized, 600)	74	74
Additional paid-in capital	2,859	2,769
Accumulated other comprehensive loss	(1,250)	(936)
Retained earnings	12,121	10,289
Less treasury stock, at cost	(1,769)	(1,422)
Total shareholders' equity	12,035	10,774
Noncontrolling interest	9	15
Total equity	12,044	10,789
Total liabilities and equity	$ 57,088	$ 55,870
Shareholders' Equity Per Share	$ 46.91	$ 41.55