Financial Instruments (Details)	3 Months Ended		9 Months Ended																																																																																																		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Apr. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Buy British pound Sell euro [Member] GBP (£)	Sep. 30, 2011 Buy British pound Sell euro [Member] EUR (€)	Sep. 30, 2011 Buy US dollar Sell euro [Member] USD ($)	Sep. 30, 2011 Buy US dollar Sell euro [Member] EUR (€)	Sep. 30, 2011 Buy euro Sell US dollar [Member] USD ($)	Sep. 30, 2011 Buy euro Sell US dollar [Member] EUR (€)	Sep. 30, 2011 Corporate Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Corporate Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Corporate Debt Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Corporate Debt Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Sep. 30, 2011 Corporate Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Corporate Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 US Government Agencies Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 US Government Agencies Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 US Government Agencies Debt Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 US Government Agencies Debt Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 US Government Agencies Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Dec. 31, 2010 US Government Agencies Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Sep. 30, 2011 US Government Agencies Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 US Government Agencies Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Other Debt Obligations [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Other Debt Obligations [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Other Debt Obligations [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Other Debt Obligations [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Sep. 30, 2011 Other Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Dec. 31, 2010 Other Debt Obligations [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Sep. 30, 2011 Other Debt Obligations [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Other Debt Obligations [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Collateralized Mortgage Backed Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Collateralized Mortgage Backed Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Collateralized Mortgage Backed Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Collateralized Mortgage Backed Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Collateralized Mortgage Backed Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Collateralized Mortgage Backed Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Sep. 30, 2011 Collateralized Mortgage Backed Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Collateralized Mortgage Backed Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Asset-backed Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Asset-backed Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Asset-backed Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Asset-backed Securities [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Asset-backed Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Asset-backed Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Sep. 30, 2011 Asset-backed Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Asset-backed Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Equity Securities, US [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Equity Securities, US [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Equity Securities, US [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Equity Securities, US [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Equity Securities, US [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Dec. 31, 2010 Equity Securities, US [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Sep. 30, 2011 Equity Securities, US [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Equity Securities, US [Member] Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Equity Method and Other Investments [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Equity Method and Other Investments [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Equity Method and Other Investments [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Equity Method and Other Investments [Member] Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Equity Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] Equity Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Dec. 31, 2010 Available-for-Sale Securities, Amortized Cost [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 1 [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member] Equity Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Equity Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] Interest Rate Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Assets [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] Foreign Exchange Contract [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2011 Hedged Fixed-Rate Debt [Member] USD ($)	Sep. 30, 2010 Hedged Fixed-Rate Debt [Member] USD ($)	Sep. 30, 2011 Hedged Fixed-Rate Debt [Member] USD ($)	Sep. 30, 2010 Hedged Fixed-Rate Debt [Member] USD ($)	Sep. 30, 2011 Equity Contract [Member] USD ($)	Sep. 30, 2011 Equity Contract [Member] USD ($)	Sep. 30, 2011 Interest Rate Contract [Member] USD ($)	Sep. 30, 2010 Interest Rate Contract [Member] USD ($)	Sep. 30, 2011 Interest Rate Contract [Member] USD ($)	Sep. 30, 2010 Interest Rate Contract [Member] USD ($)
Cash and Cash Equivalents, Fair Value Disclosure																																																																			$ 6,597,700,000	$ 5,993,200,000									$ 6,597,700,000	$ 5,993,200,000	$ 4,378,700,000	$ 2,138,600,000	$ 2,219,000,000	$ 3,854,600,000									$ 6,597,700,000	$ 5,993,200,000
Commercial Paper, at Carrying Value																																																																				540,800,000										540,800,000				540,800,000										540,800,000
Long-term Debt																																																																			(7,080,000,000)	(6,788,700,000)													(7,418,300,000)	(7,030,000,000)									(7,418,300,000)	(7,030,000,000)
Derivative Assets, Current																																																																					5,700,000		14,200,000		10,300,000	13,700,000									5,700,000		14,200,000		10,300,000	13,700,000					5,700,000		14,200,000		10,300,000	13,700,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage of Nonperforming Assets	85.00%
Notional Amount of Foreign Currency Derivative Purchase Contracts							293,200,000		1,130,000,000			854,700,000
Notional Amount of Foreign Currency Derivative Sale Contracts								336,700,000		822,500,000	1,170,000,000
Maximum Remaining Maturity of Foreign Currency Derivatives	35		35
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	90.00%		90.00%
Description of Derivative Activity Volume Percent	70.00%		70.00%
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments																																																																																																					245,400,000	122,500,000	255,700,000	359,200,000			(245,400,000)	(122,500,000)	(255,700,000)	(359,200,000)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	9,000,000		9,000,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	2,300,000	2,200,000	6,700,000	6,700,000
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(51,700,000)	20,300,000	(1,000,000)	(26,100,000)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net																																																																																																									15,500,000	41,200,000
Derivative Assets, Noncurrent																																																																							519,700,000	278,300,000													519,700,000	278,300,000									519,700,000	278,300,000
Derivative Liabilities, Current																																																																						35,600,000					6,600,000	31,600,000								35,600,000					6,600,000	31,600,000				35,600,000					6,600,000	31,600,000
Other Liabilities, Fair Value Disclosure	140,600,000		140,600,000			163,500,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	2,300,000,000		2,300,000,000
Available-for-sale Securities, Gross Unrealized Gains	78,100,000		78,100,000			262,600,000
Available-for-sale Securities, Gross Unrealized Losses	77,200,000		77,200,000			61,100,000
Available-for-sale Securities, Continuous Unrealized Gain Position, Fair Value	1,540,300,000		1,540,300,000			1,031,800,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,646,800,000		1,646,800,000			758,100,000
Other than Temporary Impairment Losses, Investments	10,900,000	4,700,000	17,900,000	11,400,000
Proceeds from Sale and Maturity of Available-for-sale Securities	775,700,000	59,900,000	1,274,200,000	427,600,000
Available-for-sale Securities, Gross Realized Gains	25,600,000	7,800,000	113,600,000	82,400,000
Available-for-sale Securities, Gross Realized Losses	2,500,000	1,600,000	7,600,000	3,900,000
Available-for-sale Securities, Current [Abstract]
Available-for-sale Securities, Debt Securities, Current													118,800,000	63,400,000	118,900,000	63,900,000	118,800,000	63,400,000	118,800,000	63,400,000	55,600,000	128,900,000	55,500,000	128,900,000	55,600,000	128,900,000	55,600,000	128,900,000	12,200,000	700,000	12,200,000	700,000	12,200,000	700,000			12,200,000	700,000
Available-for-sale Securities, Current, Total																																																																			186,600,000	733,800,000									186,600,000	734,300,000
Available-for-sale Securities, Noncurrent [Abstract]
Available-for-sale Securities, Debt Securities, Noncurrent													1,602,700,000	367,900,000	1,621,400,000	368,900,000	1,602,700,000	367,900,000	1,602,700,000	367,900,000	420,500,000	359,200,000	413,000,000	361,800,000	420,500,000	359,200,000	420,500,000	359,200,000	27,500,000	6,400,000	30,400,000	8,300,000	26,000,000	3,300,000	1,500,000	3,100,000	27,500,000	6,400,000	556,900,000	315,500,000	587,100,000	350,700,000	556,900,000	315,500,000	556,900,000	315,500,000	254,700,000	132,400,000	262,100,000	140,800,000	254,700,000	132,400,000	254,700,000	132,400,000
Available-for-sale Securities, Equity Securities, Noncurrent																																																							184,100,000	433,700,000	131,500,000	182,600,000	184,100,000	433,700,000	184,100,000	433,700,000
Other Long-term Investments																																																															173,200,000	164,400,000	173,200,000	164,400,000
Available-for-sale Securities, Noncurrent, Total																																																																			3,219,600,000	1,779,500,000									3,218,700,000	1,577,500,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,200,000,000