Income Taxes (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Effective Income Tax Rate
Statutory U.S. tax rate	35.00%	35.00%	35.00%
State income taxes--net of federal benefit	0.70%	1.20%	1.00%
International income taxes - net	(4.60%)	(7.10%)	(5.30%)
U.S. research and development credit	(0.50%)	(0.20%)	(0.30%)
Reserves for tax contingencies	(1.20%)	(0.50%)	0.80%
Medicare Modernization Act, one-time charge		1.50%
Domestic Manufacturer's deduction	(1.50%)	(1.40%)	(0.50%)
All other--net	(0.10%)	(0.80%)	(0.70%)
Effective tax rate (as a percent)	27.80%	27.70%	30.00%
Federal, State and Foreign Tax
Gross UTB Balance at January 1	$ 622	$ 618	$ 557
Additions based on tax positions related to the current year	92	128	121
Additions for tax positions of prior years	69	142	164
Reductions for tax positions of prior years	(123)	(161)	(177)
Settlements	9	(51)
Reductions due to lapse of applicable statute of limitations	(75)	(54)	(47)
Gross UTB Balance at December 31	594	622	618
Income tax
Net UTB impacting the effective tax rate	295	394	425
Period discussed over which uncertain tax positions could include material unrecognized tax benefits due to the closing of various audit years (in months)	P12M
Interest and penalties related to unrecognized tax benefits, expense (benefit) recognized on a gross basis	(1)	(9)	6
Interest and penalties related to unrecognized tax benefits, accrued on a gross basis	56	52
Change in effective income tax rate from prior reporting period to current reporting period (as a percent)	0.10%	(2.30%)
Reduction in deferred tax asset, elimination of subsidy		84
EPS impact of deferred tax asset reduction (in dollars per diluted share)		$ 0.12
Change in effective tax rate from prior reporting period to current reporting period as a result of international tax rates and other items (as a percent)	2.50%	(1.80%)
Change in effective tax rate from prior reporting period as a result of Medicare Modernization Act, one-time charge	(1.50%)	1.50%
Change in effective tax rate from prior reporting period to current reporting period as a result of adjustments to income tax reserves (as a percent)	(0.70%)	(1.30%)
Change in effective tax rate from prior reporting period to current reporting period as a result of additional Domestic Manufacturer's deductions (as a percent)		(0.90%)
Deferred tax assets valuation allowance	82	128
Deferred tax assets valuation allowance period dicussed in which a decrease is possible as a result of closure of audits with taxing authorities (in months)	P12M
Federal
Operating Loss Carryforwards
Operating loss carryforwards	17
Federal | Minimum
Operating Loss Carryforwards
Operating loss carryforwards, expiration date (in years)	18
Federal | Maximum
Operating Loss Carryforwards
Operating loss carryforwards, expiration date (in years)	19
State
Operating Loss Carryforwards
Operating loss carryforwards	9
State | Minimum
Operating Loss Carryforwards
Operating loss carryforwards, expiration date (in years)	5
State | Maximum
Operating Loss Carryforwards
Operating loss carryforwards, expiration date (in years)	10
International
Operating Loss Carryforwards
Operating loss carryforwards	$ 366
Operating loss carryforwards, expiration dates majority of high end of range (in years)	8
International | Minimum
Operating Loss Carryforwards
Operating loss carryforwards, expiration date (in years)	1