Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 3,934	$ 3,609
Investments available-for-sale, at fair value:
Fixed maturity securities, current (amortized cost of $16,894 and $17,055)	16,692	17,377
Equity Securities, Current	1,493	3,599
Other invested assets, current	21	17
Accrued investment income	162	163
Premiums Receivable, Net	4,465	3,605
Self-Funded Receivables, Net	2,278	2,580
Other receivables	2,558	2,267
Income taxes receivable	10	342
Securities lending collateral	604	455
Other current assets	2,104	2,249
Total current assets	34,321	36,263
Long-term investments available-for-sale, at fair value:
Fixed maturity securities (amortized cost of $486 and $555)	487	561
Equity securities	33	33
Other invested assets, long-term	3,726	3,344
Property and equipment, net	2,735	2,175
Goodwill	20,504	19,231
Other intangible assets	9,007	8,368
Other noncurrent assets	758	565
Total assets	71,571	70,540
Liabilities and shareholders' equity
Medical claims payable	7,454	7,992
Reserves for future policy benefits	75	70
Other policyholder liabilities	2,590	2,950
Total policy liabilities	10,119	11,012
Unearned income	902	860
Accounts payable and accrued expenses	4,959	5,024
Security trades pending payable	197	113
Securities lending payable	604	454
Short-term borrowings	1,145	1,275
Current portion of long-term debt	849	1,275
Other current liabilities	3,190	3,343
Total current liabilities	21,965	23,356
Long-term debt, less current portion	17,217	17,382
Reserves for future policy benefits, noncurrent	706	647
Deferred tax liabilities, net	1,960	1,727
Other noncurrent liabilities	1,182	925
Total liabilities	43,030	44,037
Commitments and contingencies-Note 13
Shareholders' equity
Preferred stock, without par value, shares authorized - 100,000,000; shares issued and outstanding - none	0	0
Common stock, par value $0.01, shares authorized - 900,000,000; shares issued and outstanding - 257,395,577 and 256,084,913	3	3
Additional paid-in capital	9,536	8,547
Retained earnings	19,988	18,054
Accumulated other comprehensive loss	(986)	(101)
Total shareholders' equity	28,541	26,503
Total liabilities and shareholders' equity	$ 71,571	$ 70,540