| **Description Of Business And Basis Of Presentation New revenue standard adoption - Income Statement at Period End (Details) - USD ($) $ / shares in Units, $ in Millions** | 3 Months Ended | 6 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 1,286        | $ 959          | $ 2,423 | $ 2,408 |
| Cost of Revenue                                                                                                                                                             | 418            | 389            | 633 | 543 |
| Gross Profit                                                                                                                                                                | 868            | 570            | 1,790 | 1,865 |
| Operating Expenses                                                                                                                                                          | 610            | 611            | 1,232 | 1,163 |
| Operating Income (Loss)                                                                                                                                                     | 258            | (41)           | 558 | 702 |
| Interest and other income (expense), net                                                                                                                                    | 18             | 3              | 37 | 9 |
| Income before provision for income taxes                                                                                                                                    | 276            | (38)           | 595 | 711 |
| Provision for income taxes                                                                                                                                                  | 21             | (16)           | 47 | 89 |
| Net income (loss)                                                                                                                                                           | $ 255          | $ (22)         | $ 548 | $ 622 |
| Earnings Per Share, Basic                                                                                                                                                   | $ 0.84         | $ (0.07)       | $ 1.80 | $ 2.01 |
| Earnings Per Share, Diluted                                                                                                                                                 | $ 0.83         | $ (0.07)       | $ 1.77 | $ 1.99 |
| Difference between Revenue Guidance in Effect before and after Topic 606, Percentage [Member]                                                                               |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Revenues, percent                                                                                                                                                           | 35.00%         |           | 2.00% |   |
| Cost of revenue, percent                                                                                                                                                    | 12.00%         |           | 17.00% |   |
| Gross profit, percent                                                                                                                                                       | 50.00%         |           | (2.00%) |   |
| Operating expenses, percent                                                                                                                                                 | 0.00%          |           | 0.00% |   |
| Operating income (loss), percent                                                                                                                                            | (960.00%)      |           | (7.00%) |   |
| Other nonoperating income (expense), percent                                                                                                                                | 0.00%          |           | 0.00% |   |
| Income before provision for income taxes, percent                                                                                                                           | (2400.00%)     |           | (6.00%) |   |
| Income tax expense (benefit), percent                                                                                                                                       | 200.00%        |           | (34.00%) |   |
| Net income (loss), percent                                                                                                                                                  | (1442.00%)     |           | (3.00%) |   |
| Earnings per share, basic, percent                                                                                                                                          | (1500.00%)     |           | (3.00%) |   |
| Earnings per share, diluted, percent                                                                                                                                        | (1483.00%)     |           | (3.00%) |   |
| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                                                                                           |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 332          |           | $ 53 |   |
| Cost of Revenue                                                                                                                                                             | 44             |           | 93 |   |
| Gross Profit                                                                                                                                                                | 288            |           | (40) |   |
| Operating Expenses                                                                                                                                                          | 0              |           | 0 |   |
| Operating Income (Loss)                                                                                                                                                     | 288            |           | (40) |   |
| Interest and other income (expense), net                                                                                                                                    | 0              |           | 0 |   |
| Income before provision for income taxes                                                                                                                                    | 288            |           | (40) |   |
| Provision for income taxes                                                                                                                                                  | 14             |           | (24) |   |
| Net income (loss)                                                                                                                                                           | $ 274          |           | $ (16) |   |
| Earnings Per Share, Basic                                                                                                                                                   | $ 0.90         |           | $ (0.05) |   |
| Earnings Per Share, Diluted                                                                                                                                                 | $ 0.89         |           | $ (0.06) |   |
| Product [Member]                                                                                                                                                            |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 623          | $ 454          | $ 825 | $ 1,282 |
| Cost of Revenue                                                                                                                                                             | $ 222          | 300            | $ 290 | 364 |
| Product [Member] | Difference between Revenue Guidance in Effect before and after Topic 606, Percentage [Member]                                                            |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Revenues, percent                                                                                                                                                           | 43.00%         |           | (28.00%) |   |
| Cost of revenue, percent                                                                                                                                                    | (21.00%)       |           | (19.00%) |   |
| Product [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                                                                        |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 186          |           | $ (328) |   |
| Cost of Revenue                                                                                                                                                             | (58)           |           | (68) |   |
| Service [Member]                                                                                                                                                            |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | 663            | 505            | 1,598 | 1,126 |
| Cost of Revenue                                                                                                                                                             | $ 196          | $ 89           | $ 343 | $ 179 |
| Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606, Percentage [Member]                                                            |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Revenues, percent                                                                                                                                                           | 28.00%         |           | 31.00% |   |
| Cost of revenue, percent                                                                                                                                                    | 109.00%        |           | 88.00% |   |
| Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                                                                        |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 146          |           | $ 381 |   |
| Cost of Revenue                                                                                                                                                             | 102            |           | 161 |   |
| Accounting Standards Update 2014-09 [Member]                                                                                                                                |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | 1,286          |           | 2,423 |   |
| Cost of Revenue                                                                                                                                                             | 418            |           | 633 |   |
| Gross Profit                                                                                                                                                                | 868            |           | 1,790 |   |
| Operating Expenses                                                                                                                                                          | 610            |           | 1,232 |   |
| Operating Income (Loss)                                                                                                                                                     | 258            |           | 558 |   |
| Interest and other income (expense), net                                                                                                                                    | 18             |           | 37 |   |
| Income before provision for income taxes                                                                                                                                    | 276            |           | 595 |   |
| Provision for income taxes                                                                                                                                                  | 21             |           | 47 |   |
| Net income (loss)                                                                                                                                                           | $ 255          |           | $ 548 |   |
| Earnings Per Share, Basic                                                                                                                                                   | $ 0.84         |           | $ 1.80 |   |
| Earnings Per Share, Diluted                                                                                                                                                 | $ 0.83         |           | $ 1.77 |   |
| Accounting Standards Update 2014-09 [Member] | Product [Member]                                                                                                             |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 623          |           | $ 825 |   |
| Cost of Revenue                                                                                                                                                             | 222            |           | 290 |   |
| Accounting Standards Update 2014-09 [Member] | Service [Member]                                                                                                             |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | 663            |           | 1,598 |   |
| Cost of Revenue                                                                                                                                                             | 196            |           | 343 |   |
| Calculated under Revenue Guidance in Effect before Topic 606 [Member]                                                                                                       |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | 954            |           | 2,370 |   |
| Cost of Revenue                                                                                                                                                             | 374            |           | 540 |   |
| Gross Profit                                                                                                                                                                | 580            |           | 1,830 |   |
| Operating Expenses                                                                                                                                                          | 610            |           | 1,232 |   |
| Operating Income (Loss)                                                                                                                                                     | (30)           |           | 598 |   |
| Interest and other income (expense), net                                                                                                                                    | 18             |           | 37 |   |
| Income before provision for income taxes                                                                                                                                    | (12)           |           | 635 |   |
| Provision for income taxes                                                                                                                                                  | 7              |           | 71 |   |
| Net income (loss)                                                                                                                                                           | $ (19)         |           | $ 564 |   |
| Earnings Per Share, Basic                                                                                                                                                   | $ (0.06)       |           | $ 1.85 |   |
| Earnings Per Share, Diluted                                                                                                                                                 | $ (0.06)       |           | $ 1.83 |   |
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Product [Member]                                                                                    |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | $ 437          |           | $ 1,153 |   |
| Cost of Revenue                                                                                                                                                             | 280            |           | 358 |   |
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service [Member]                                                                                    |           |           |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                      |           |           |   |   |
| Net revenue                                                                                                                                                                 | 517            |           | 1,217 |   |
| Cost of Revenue                                                                                                                                                             | $ 94           |           | $ 182 |   |

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Earnings per share, diluted, percent
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Gross profit, percent
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Income before provision for income taxes, percent
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Income tax expense (benefit), percent
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Net income (loss), percent
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Operating expenses, percent
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Operating income (loss), percent
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Other nonoperating income (expense), percent
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Revenues, percent
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| - Definition
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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| - Definition
The aggregate cost of goods produced and sold and services rendered during the reporting period.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
+ References
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| - Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.
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| - Definition
Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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