Schedule I Schedule I Condensed Balance Sheet (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Current assets:
Cash and cash equivalents	$ 9,429	$ 9,123	$ 9,800	$ 7,426
Deferred income taxes	472	403
Prepaid expenses and other current assets	615	541
Total current assets	20,350	18,393
Other assets	2,088	2,108
Total assets	67,889	63,063	59,045
Current liabilities:
Accounts payable and accrued liabilities	6,853	6,488
Commercial paper and current maturities of long-term debt	982	2,480
Total current liabilities	23,922	23,700
Long-term debt, less current maturities	10,656	8,662
Deferred income taxes and other liabilities	2,574	2,515
Total liabilities	39,597	37,238
Commitments and contingencies (Note 4)
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	23,606	20,780
Total liabilities and shareholders' equity	67,889	63,063
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	3,000,000,000	3,000,000,000
Common Stock, Shares, Issued	1,039,000,000	1,086,000,000
Common Stock, Shares, Outstanding	1,039,000,000	1,086,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Parent Company [Member]
Current assets:
Cash and cash equivalents	1,506	916	2,309	880
Deferred income taxes	82	57
Prepaid expenses and other current assets	97	207
Total current assets	1,685	1,180
Equity in net assets of subsidiaries	38,688	36,246
Other assets	77	110
Total assets	40,450	37,536
Current liabilities:
Accounts payable and accrued liabilities	351	301
Note payable to subsidiary	145	130
Commercial paper and current maturities of long-term debt	982	2,480
Total current liabilities	1,478	2,911
Long-term debt, less current maturities	10,656	8,662
Deferred income taxes and other liabilities	24	138
Total liabilities	12,158	11,711
Commitments and contingencies (Note 4)
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	$ 40,450	$ 37,536