Financial Instruments (Details 2) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets
Fair Value	$ 3,930	$ 3,657
Derivative assets	864	628
Total assets	4,794	4,285
Liabilities
Derivative liabilities	144	61
Foreign exchange contract [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Interest rate swap contract [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	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
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	94	117
Commercial paper [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Total assets	278	298
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Investments	94	117
Securities held for employee compensation	184	181
Purchased currency options	0	0
Derivative assets	0	0
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
Derivative liabilities	0	0
Foreign exchange contract [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	347	95
Liabilities
Derivative liabilities	140	54
Interest rate swap contract [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	6	56
Liabilities
Derivative liabilities	0	7
Corporate notes and bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,554	1,133
U.S. government and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	605	500
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	173	171
Mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	163	99
Foreign government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	51	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	49	23
Commercial paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,054	1,046
Significant Other Observable Inputs (Level 2) [Member]
Assets
Total assets	4,516	3,974
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Investments	3,652	3,346
Securities held for employee compensation	0	0
Purchased currency options	511	477
Derivative assets	864	628
Liabilities
Total liabilities	144	61
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Derivative liabilities	4	0
Foreign exchange contract [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Interest rate swap contract [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	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
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
Commercial paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	0	0
Significant Unobservable Inputs (Level 3) [Member]
Assets
Total assets	0	13
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
Derivative assets	0	0
Liabilities
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Derivative liabilities	0	0
Foreign exchange contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	347	95
Liabilities
Derivative liabilities	140	54
Interest rate swap contract [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	6	56
Liabilities
Derivative liabilities	0	7
Corporate notes and bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,554	1,133
U.S. government and agency securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	605	500
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	173	171
Mortgage-backed securities [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	163	112
Foreign government bonds [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	51	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	143	140
Commercial paper [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Fair Value	1,054	1,046
Fair Value, Measurements, Recurring [Member]
Assets
Investments	3,746	3,476
Securities held for employee compensation	184	181
Purchased currency options	511	477
Derivative assets	864	628
Liabilities
Total liabilities	144	61
Fair Value, Measurements, Recurring [Member] | Written Currency Options [Member]
Liabilities
Derivative liabilities	4	0
Corporate notes and bonds [Member]
Assets
Fair Value	1,554	1,133
U.S. government and agency securities [Member]
Assets
Fair Value	605	500
Municipal securities [Member]
Assets
Fair Value	0	361
Asset-backed securities [Member]
Assets
Fair Value	173	171
Mortgage-backed securities [Member]
Assets
Fair Value	163	112
Foreign government bonds [Member]
Assets
Fair Value	51	10
Other debt securities [Member]
Assets
Fair Value	3	3
Equity securities [Member]
Assets
Fair Value	327	321
Commercial paper [Member]
Assets
Fair Value	$ 1,054	$ 1,046