Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Fair Value	$ 10,202	$ 5,069
Derivative assets	731	755
Liabilities
Derivative liabilities	229	108
Commercial paper [Member]
Assets
Fair Value	2,150	1,029
Corporate notes and bonds [Member]
Assets
Fair Value	5,063	2,032
U.S. government and agency securities [Member]
Assets
Fair Value	1,206	1,021
Asset-backed securities [Member]
Assets
Fair Value	837	292
Mortgage-backed securities [Member]
Assets
Fair Value	435	223
Foreign government bonds [Member]
Assets
Fair Value	108	72
Equity securities [Member]
Assets
Fair Value	403	397
Other debt securities [Member]
Assets
Fair Value		3
Fair Value, Measurements, Recurring [Member]
Assets
Investments	9,995	4,899
Securities held for employee compensation	207	170
Purchased currency options	546	613
Derivative assets	731	755
Total assets	10,933	5,824
Liabilities
Total liabilities	229	108
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]
Assets
Derivative assets	185	142
Liabilities
Derivative liabilities	216	107
Fair Value, Measurements, Recurring [Member] | Written currency options [Member]
Liabilities
Derivative liabilities	13	1
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Assets
Fair Value	2,150	1,029
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Investments	196	205
Securities held for employee compensation	169	170
Purchased currency options
Derivative assets
Total assets	365	375
Liabilities
Total liabilities
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Foreign exchange contract [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Written currency options [Member]
Liabilities
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Commercial paper [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Investments	9,799	4,694
Securities held for employee compensation	38
Purchased currency options	546	613
Derivative assets	731	755
Total assets	10,568	5,449
Liabilities
Total liabilities	229	108
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign exchange contract [Member]
Assets
Derivative assets	185	142
Liabilities
Derivative liabilities	216	107
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Written currency options [Member]
Liabilities
Derivative liabilities	13	1
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial paper [Member]
Assets
Fair Value	2,150	1,029
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Investments
Securities held for employee compensation
Purchased currency options
Derivative assets
Total assets
Liabilities
Total liabilities
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign exchange contract [Member]
Assets
Derivative assets
Liabilities
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Written currency options [Member]
Liabilities
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commercial paper [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Corporate notes and bonds [Member]
Assets
Fair Value	5,063	2,032
Fair Value, Measurements, Recurring [Member] | Corporate notes and bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Corporate notes and bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value	5,063	2,032
Fair Value, Measurements, Recurring [Member] | Corporate notes and bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | U.S. government and agency securities [Member]
Assets
Fair Value	1,206	1,021
Fair Value, Measurements, Recurring [Member] | U.S. government and agency securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | U.S. government and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value	1,206	1,021
Fair Value, Measurements, Recurring [Member] | U.S. government and agency securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]
Assets
Fair Value	837	292
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value	837	292
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member]
Assets
Fair Value	435	223
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value	435	223
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Foreign government bonds [Member]
Assets
Fair Value	108	72
Fair Value, Measurements, Recurring [Member] | Foreign government bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Foreign government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value	108	72
Fair Value, Measurements, Recurring [Member] | Foreign government bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]
Assets
Fair Value	196	227
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value	196	205
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value		22
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member]
Assets
Fair Value		3
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Assets
Fair Value
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Fair Value		3
Fair Value, Measurements, Recurring [Member] | Other debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Fair Value