Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 9,429	$ 9,123
Short-term investments	2,577	2,072
Accounts receivable, net of allowances of $196 and $241	2,294	2,061
Other current receivables, net of allowances of $72 and $66	2,255	1,643
Assets under management	2,708	2,550
Deferred income taxes	472	403
Prepaid expenses and other current assets	615	541
Total current assets	20,350	18,393
Long-term investments	16,166	14,707
Property, equipment and capitalized software, net of accumulated depreciation and amortization of $2,440 and $2,779	2,515	2,200
Goodwill	23,975	22,745
Other intangible assets, net of accumulated amortization of $1,451 and $1,350	2,795	2,910
Other assets	2,088	2,108
Total assets	67,889	63,063
Current liabilities:
Medical costs payable	9,799	9,220
Accounts payable and accrued liabilities	6,853	6,488
Other policy liabilities	5,063	3,979
Commercial paper and current maturities of long-term debt	982	2,480
Unearned revenues	1,225	1,533
Total current liabilities	23,922	23,700
Long-term debt, less current maturities	10,656	8,662
Future policy benefits	2,445	2,361
Deferred income taxes and other liabilities	2,574	2,515
Total liabilities	39,597	37,238
Commitments and contingencies (Note 12)
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; 1,039 and 1,086 issued and outstanding	10	11
Retained earnings	27,821	25,562
Accumulated other comprehensive income (loss):
Net unrealized gains on investments, net of tax effects	476	280
Foreign currency translation losses	(15)	(28)
Total shareholders' equity	28,292	25,825
Total liabilities and shareholders' equity	$ 67,889	$ 63,063