Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 10,038	$ 8,406
Short-term investments	3,019	3,031
Accounts receivable, net	3,185	2,709
Other current receivables, net	2,614	2,889
Assets under management	2,659	2,773
Deferred income taxes	336	463
Prepaid expenses and other current assets	866	781
Total current assets	22,717	21,052
Long-term investments	17,998	17,711
Property, equipment and capitalized software, net	3,945	3,939
Goodwill	31,810	31,286
Other intangible assets, net	4,309	4,682
Other assets	2,347	2,215
Total assets	83,126	80,885
Current liabilities:
Medical costs payable	11,726	11,004
Accounts payable and accrued liabilities	6,559	6,984
Other policy liabilities	5,122	4,910
Commercial paper and current maturities of long-term debt	2,390	2,713
Unearned revenues	1,386	1,505
Total current liabilities	27,183	27,116
Long-term debt, less current maturities	15,659	14,041
Future policy benefits	2,447	2,444
Deferred income taxes	2,321	2,450
Other liabilities	1,571	1,535
Total liabilities	49,181	47,586
Commitments and contingencies (Note 8)
Redeemable noncontrolling interest	2,188	2,121
Shareholders' equity:
Preferred stock, $0.001 par value - 10 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value - 3,000 shares authorized; 1,013 and 1,019 issued and outstanding	10	10
Additional paid-in capital	0	66
Retained earnings	31,359	30,664
Accumulated other comprehensive income	388	438
Total shareholders' equity	31,757	31,178
Total liabilities and shareholders’ equity	$ 83,126	$ 80,885