Note 11.3 Equity, Stockholders' Equity Activity Level 4 (Details) (USD $) Share data in Millions, except Per Share data	3 Months Ended				6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period	$ 6,896,849,000	$ 6,608,800,000	$ 6,121,322,000	$ 5,824,765,000	$ 6,608,800,000	$ 5,824,765,000
Consolidated net income	115,518,000	129,660,000	130,343,000	164,610,000	245,178,000	294,953,000
Change in net unrealized (loss) gain on investments, net of tax of nil	(1,500,000)	4,400,000	(1,300,000)	(400,000)	2,900,000	(1,700,000)
Change in foreign currency translation adjustment, net of tax of nil	2,600,000	6,600,000	(4,800,000)	(2,700,000)	9,200,000	(7,500,000)
Stock Issued During Period, Value, Employee Stock Purchase Plan		23,700,000		20,800,000
Stock Issued During Period, Value, Stock Options Exercised	37,900,000	241,700,000	53,700,000	101,200,000
Value Shares Assumed In Connection With Business Acquisition			2,300,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(1,000,000)	(2,000,000)
Common stock repurchased and retired under stock repurchase programs, value	(150,000,000)	(200,200,000)	(177,400,000)	(74,400,000)	(350,200,000)	(251,800,000)
Shares Repuchased And Retired Related To Net Issuances		(4,900,000)		(1,800,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value	58,600,000	47,600,000	43,300,000	40,600,000
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation	2,000,000	39,400,000	5,400,000	50,600,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period	6,961,930,000	6,896,849,000	6,171,805,000	6,121,322,000	6,961,930,000	6,171,805,000
Stock Repurchased and Retired During Period, Shares	3.9		6.5		8.6	9.2
Common Stock Repurchased Under Stock Repurchase Program Average Purchase Price	$ 38.94		$ 27.33		$ 40.71	$ 27.24
Stock Repurchase Program 2010 [Member]
Stock Repurchase Program, Remaining Authorized Repurchase Amount					404,800,000
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period	9,998,125,000	9,717,783,000	9,267,584,000	9,060,089,000	9,717,783,000	9,060,089,000
Consolidated net income	0	0	0	0
Change in net unrealized (loss) gain on investments, net of tax of nil	0	0	0	0
Change in foreign currency translation adjustment, net of tax of nil	0	0	0	0
Stock Issued During Period, Value, Employee Stock Purchase Plan		23,700,000		20,800,000
Stock Issued During Period, Value, Stock Options Exercised	37,900,000	241,700,000	53,700,000	101,200,000
Value Shares Assumed In Connection With Business Acquisition			2,300,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			0	0
Common stock repurchased and retired under stock repurchase programs, value	(55,200,000)	(70,300,000)	(9,100,000)	(5,700,000)
Shares Repuchased And Retired Related To Net Issuances		(1,800,000)		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value	58,600,000	47,600,000	43,300,000	40,600,000
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation	2,000,000	39,400,000	5,400,000	50,600,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period	10,041,423,000	9,998,125,000	9,363,244,000	9,267,584,000	10,041,423,000	9,363,244,000
Accumulated Other Comprehensive Income [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period	9,746,000	(1,251,000)	(4,467,000)	(1,433,000)	(1,251,000)	(1,433,000)
Consolidated net income	0	0	0	0
Change in net unrealized (loss) gain on investments, net of tax of nil	(1,500,000)	4,400,000	(1,300,000)	(400,000)
Change in foreign currency translation adjustment, net of tax of nil	2,600,000	6,600,000	(4,800,000)	(2,700,000)
Stock Issued During Period, Value, Employee Stock Purchase Plan		0		0
Stock Issued During Period, Value, Stock Options Exercised	0	0	0	0
Value Shares Assumed In Connection With Business Acquisition			0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			0	0
Common stock repurchased and retired under stock repurchase programs, value	0	0	0	0
Shares Repuchased And Retired Related To Net Issuances		0		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value	0	0	0	0
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation	0	0	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period	10,770,000	9,746,000	(10,567,000)	(4,467,000)	10,770,000	(10,567,000)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period	(3,111,537,000)	(3,108,337,000)	(3,143,924,000)	(3,236,525,000)	(3,108,337,000)	(3,236,525,000)
Consolidated net income	115,560,000	129,750,000	130,511,000	163,115,000
Change in net unrealized (loss) gain on investments, net of tax of nil	0	0	0	0
Change in foreign currency translation adjustment, net of tax of nil	0	0	0	0
Stock Issued During Period, Value, Employee Stock Purchase Plan		0		0
Stock Issued During Period, Value, Stock Options Exercised	0	0	0	0
Value Shares Assumed In Connection With Business Acquisition			0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			0	0
Common stock repurchased and retired under stock repurchase programs, value	(94,800,000)	(129,900,000)	(168,300,000)	(68,700,000)
Shares Repuchased And Retired Related To Net Issuances		(3,100,000)		(1,800,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value	0	0	0	0
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation	0	0	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period	(3,090,731,000)	(3,111,537,000)	(3,181,733,000)	(3,143,924,000)	(3,090,731,000)	(3,181,733,000)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, beginning of period	510,000	600,000	2,124,000	2,629,000	600,000	2,629,000
Consolidated net income	(142,000)	(90,000)	(168,000)	1,495,000
Change in net unrealized (loss) gain on investments, net of tax of nil	0	0	0	0
Change in foreign currency translation adjustment, net of tax of nil	0	0	0	0
Stock Issued During Period, Value, Employee Stock Purchase Plan		0		0
Stock Issued During Period, Value, Stock Options Exercised	0	0	0	0
Value Shares Assumed In Connection With Business Acquisition			0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(1,000,000)	(2,000,000)
Common stock repurchased and retired under stock repurchase programs, value	0	0	0	0
Shares Repuchased And Retired Related To Net Issuances		0		0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value	0	0	0	0
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation	0	0	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, end of period	$ 368,000	$ 510,000	$ 856,000	$ 2,124,000	$ 368,000	$ 856,000