| **Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) (USD $)In Millions, unless otherwise specified** | 9 Months Ended |        |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|
||
| **Derivative**                                                                                                                                                |           |   |
| Foreign Currency Forward And Option Contracts Maximum Maturity Period                                                                                         | 12 months      |   |
| Maturity period of foreign currency forward contracts, Maximum                                                                                                | 3 months       |   |
| Fair value of foreign currency contracts outstanding, Assets                                                                                                  |           | $ 6    |
| Fair value of foreign currency contracts outstanding, Liabilities                                                                                             | 1              |   |
| Foreign exchange option contracts                                                                                                                             |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Fair value of foreign currency contracts outstanding, Assets                                                                                                  |           | 6      |
| Foreign exchange forward contracts                                                                                                                            |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Fair value of foreign currency contracts outstanding, Liabilities                                                                                             | 1              |   |
| Foreign currency contracts to purchase | Designated as Hedging Instrument [Member]                                                                            |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 95             | 84     |
| Foreign currency contracts to purchase | Designated as Hedging Instrument [Member] | Foreign exchange option contracts                                        |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 22             | 84     |
| Foreign currency contracts to purchase | Designated as Hedging Instrument [Member] | Foreign exchange forward contracts                                       |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 73             |   |
| Foreign currency contracts to sell | Designated as Hedging Instrument [Member]                                                                                |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 128            | 149    |
| Foreign currency contracts to sell | Designated as Hedging Instrument [Member] | Foreign exchange option contracts                                            |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 36             | 149    |
| Foreign currency contracts to sell | Designated as Hedging Instrument [Member] | Foreign exchange forward contracts                                           |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 92             |   |
| Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member]                                                                                |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative Liability, Current                                                                                                                                 | 1              |   |
| Derivative, Notional amount                                                                                                                                   | 713            | 306    |
| Derivative Asset, Current                                                                                                                                     | 3              |   |
| Foreign currency contracts to purchase | United States Dollar [Member] | Not Designated as Hedging Instrument [Member]                                        |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 101            | 87     |
| Foreign currency contracts to purchase | Balance Sheet Hedging [Member] | British Pounds Sterling [Member] | Not Designated as Hedging Instrument [Member]    |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 1              |   |
| Foreign currency contracts to sell | United States Dollar [Member] | Not Designated as Hedging Instrument [Member]                                            |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | 601            | 213    |
| Foreign currency contracts to sell | British Pounds Sterling [Member] | Not Designated as Hedging Instrument [Member]                                         |           |   |
| **Derivative**                                                                                                                                                |           |   |
| Derivative, Notional amount                                                                                                                                   | $ 10           | $ 6    |

| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Foreign Currency Forward And Option Contracts Maximum Maturity Period
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Foreign Currency Forward Contracts Maximum Maturity Period
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of all asset derivatives designated as cash flow hedging instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of all liability derivatives designated as cash flow hedging instruments.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other 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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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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