| **Location of Gain (Loss) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| Interest And Other Income (Expense), Net [Member]                                                                                                           |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Foreign currency forward contracts not designated as hedging instruments                                                                                    | $ (5)           | $ (2) | $ 21 |
| Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]                                                                 |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Derivative, Notional amount                                                                                                                                 |            | 219 |   |
| United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to purchase [Member]                             |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Derivative, Notional amount                                                                                                                                 | 140             | 87 |   |
| United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]                                 |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Derivative, Notional amount                                                                                                                                 | 232             | 213 |   |
| British Pounds Sterling [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]                              |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Derivative, Notional amount                                                                                                                                 |            | 6 |   |
| Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member]                                                                              |            |   |   |
| **Derivative Instruments, Gain (Loss) [Line Items]**                                                                                                        |            |   |   |
| Derivative Liability, Current                                                                                                                               | $ 1             |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B
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| X                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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