Financial Instruments (Details 3) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Assets
Fair Value	$ 4,011	$ 3,657
Fair Value of Derivative, Asset	557	628
Liabilities
Fair Value of Derivative, Liability	68	61
Foreign exchange contract [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	0	0
Liabilities
Fair Value of Derivative, Liability	0	0
Interest rate swap contract [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	0	0
Liabilities
Fair Value of Derivative, Liability	0	0
Corporate notes and bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
U.S. government and agency securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Commercial paper [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Municipal securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Asset-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Mortgage-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Foreign government bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Other debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Equity securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	96	117
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Investments	96	117
Securities held for employee compensation	197	181
Purchased currency options	0	0
Fair Value of Derivative, Asset	0	0
Total assets	293	298
Liabilities
Total liabilities	0	0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Fair Value of Derivative, Liability	0
Foreign exchange contract [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	106	95
Liabilities
Fair Value of Derivative, Liability	62	54
Interest rate swap contract [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	72	56
Liabilities
Fair Value of Derivative, Liability	0	7
Corporate notes and bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,377	1,133
U.S. government and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	523	500
Commercial paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,411	1,046
Municipal securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	361
Asset-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	183	171
Mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	134	99
Foreign government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	56	10
Other debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	3	3
Equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	31	23
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Investments	3,718	3,346
Securities held for employee compensation	0	0
Purchased currency options	379	477
Fair Value of Derivative, Asset	557	628
Total assets	4,275	3,974
Liabilities
Total liabilities	68	61
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Fair Value of Derivative, Liability	6	0
Foreign exchange contract [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	0	0
Liabilities
Fair Value of Derivative, Liability	0	0
Interest rate swap contract [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	0	0
Liabilities
Fair Value of Derivative, Liability	0	0
Corporate notes and bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
U.S. government and agency securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Commercial paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Municipal securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Asset-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Mortgage-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	13
Foreign government bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Other debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Investments	0	13
Securities held for employee compensation	0	0
Purchased currency options	0	0
Fair Value of Derivative, Asset	0	0
Total assets	0	13
Liabilities
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Fair Value of Derivative, Liability	0	0
Foreign exchange contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	106	95
Liabilities
Fair Value of Derivative, Liability	62	54
Interest rate swap contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value of Derivative, Asset	72	56
Liabilities
Fair Value of Derivative, Liability	0	7
Corporate notes and bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,377	1,133
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	523	500
Commercial paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,411	1,046
Municipal securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	361
Asset-backed securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	183	171
Mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	134	112
Foreign government bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	56	10
Other debt securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	3	3
Equity securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	127	140
Fair Value, Measurements, Recurring [Member]
Assets
Investments	3,814	3,476
Securities held for employee compensation	197	181
Purchased currency options	379	477
Fair Value of Derivative, Asset	557	628
Total assets	4,568	4,285
Liabilities
Total liabilities	68	61
Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Fair Value of Derivative, Liability	6	0
Corporate notes and bonds [Member]
Assets
Fair Value	1,377	1,133
U.S. government and agency securities [Member]
Assets
Fair Value	523	500
Commercial paper [Member]
Assets
Fair Value	1,411	1,046
Municipal securities [Member]
Assets
Fair Value	0	361
Asset-backed securities [Member]
Assets
Fair Value	183	171
Mortgage-backed securities [Member]
Assets
Fair Value	134	112
Foreign government bonds [Member]
Assets
Fair Value	56	10
Other debt securities [Member]
Assets
Fair Value	3	3
Equity securities [Member]
Assets
Fair Value	$ 324	$ 321