| **Financing Arrangement (Senior Notes) (Details) - USD ($) $ in Millions** | 1 Months Ended  | 6 Months Ended   |         |         |
|----------------------------------------------------------------------------|-----------------|------------------|---------|---------|
||
| **Debt Instrument [Line Items]**                                           |            |             |    |    |
| Senior Notes, Noncurrent                                                   |            | $ 990            | $ 989   |    |
| Proceeds from Issuance of Senior Long-term Debt                            | $ 989           |             |    |    |
| 2021 Notes                                                                 |            |             |    |    |
| **Debt Instrument [Line Items]**                                           |            |             |    |    |
| Effective interest rate                                                    |            |             |    | 3.94%   |
| Debt Instrument, Convertible, Remaining Discount Amortization Period       |            | 4 years 5 months |    |    |
| Long-term Debt                                                             |            |             |    | $ 600   |
| Debt Instrument, Interest Rate, Stated Percentage                          |            |             |    | 3.70%   |
| Debt Instrument, Maturity Date                                             | Mar.  01,  2021 |             |    |    |
| 2026 Notes                                                                 |            |             |    |    |
| **Debt Instrument [Line Items]**                                           |            |             |    |    |
| Effective interest rate                                                    |            |             |    | 4.97%   |
| Debt Instrument, Convertible, Remaining Discount Amortization Period       |            | 9 years 5 months |    |    |
| Long-term Debt                                                             |            |             |    | $ 400   |
| Debt Instrument, Interest Rate, Stated Percentage                          |            |             |    | 4.80%   |
| Debt Instrument, Maturity Date                                             | Mar.  01,  2026 |             |    |    |
| Senior Notes                                                               |            |             |    |    |
| **Debt Instrument [Line Items]**                                           |            |             |    |    |
| Debt Instrument, Issuance Date                                             | Feb. 24,  2016  |             |    |    |
| Long-term Debt                                                             |            |             |    | $ 1,000 |
| Debt Instrument, Unamortized Discount (Premium), Net                       |            | $ (2)            | (2)     | (2)     |
| Debt Issuance Costs, Noncurrent, Net                                       |            | (8)              | (9)     | $ (9)   |
| Debt Instrument, Fair Value Disclosure                                     |            | $ 1,082          | $ 1,039 |    |
| Senior Notes, Frequency of Periodic Payment                                | semiannually    |             |    |    |
| Debt Instrument, Redemption Price, Percentage                              |            | 100.00%          |    |    |
| Change of control repurchase event                                         |            |             |    |    |
| **Debt Instrument [Line Items]**                                           |            |             |    |    |
| Debt Instrument, Redemption Price, Percentage                              |            | 101.00%          |    |    |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of the frequency of periodic payments (monthly, quarterly, annual).
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated amortization, of debt discount (premium).
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| - Definition
Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).
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| - Definition
Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.
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