| **Stock-based Compensation - Textual Information (Details)**                                                  | 6 Months Ended | 12 Months Ended          |
|---------------------------------------------------------------------------------------------------------------|----------------|--------------------------|
||
| **Stock-Based Compensation**                                                                                  |           |                     |   |   |
| Employee service share-based compensation, allocation of recognized period costs, capitalized amount          |           | $ 0                      |   |   |
| Shares authorized for issuance (in shares) | shares                                                           |           | 60,700,000               |   |   |
| Shares available for issuance (in shares) | shares                                                            |           | 16,900,000               |   |   |
| **Stock Options**                                                                                             |           |                     |   |   |
| Number of annual installment payments outstanding | installment                                               |           | 3                        |   |   |
| Option expiration from date of grant (in years)                                                               |           | 10 years                 |   |   |
| Weighted average remaining term of options outstanding (in years)                                             |           | 3 years 9 months 7 days  |   |   |
| Weighted average remaining term of options exercisable (in years)                                             |           | 3 years 7 months 28 days |   |   |
| Intrinsic value of options exercised                                                                          |           | $ 11,000,000             | $ 15,000,000 | $ 70,000,000 |
| Tax benefit from stock options exercised                                                                      |           | 1,000,000                | 3,800,000 | 19,600,000 |
| Fair value of options vested in period                                                                        |           | 13,000,000               | $ 24,000,000 | $ 29,000,000 |
| Intrinsic value of stock options outstanding                                                                  |           | 97,000,000               |   |   |
| Intrinsic value of stock options vested and exercisable                                                       |           | $ 96,000,000             |   |   |
| Quoted price of common stock to calculate intrinsic value of stock options (USD per share) | $ / shares       |           | $ 64.97                  |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Percentage discount on fair market value of common stock under employee stock purchase plan (as a percentage) |           | 15.00%                   |   |   |
| Shares authorized for issuance (in shares) | shares                                                           |           | 60,700,000               |   |   |
| Shares available for issuance (in shares) | shares                                                            |           | 16,900,000               |   |   |
| Stock Options                                                                                                 |           |                     |   |   |
| **Stock Options**                                                                                             |           |                     |   |   |
| Options granted (in shares) | shares                                                                          |           | 0                        | 0 |   |
| Unrecognized compensation cost as of balance sheet date                                                       |           | $ 1,000,000              |   |   |
| **Restricted Stock Awards and Units**                                                                         |           |                     |   |   |
| Unrecognized compensation cost as of balance sheet date                                                       |           | $ 1,000,000              |   |   |
| Weighted average period of unrecognized compensation cost expected to recognize (in years)                    |           | 6 months                 |   |   |
| Restricted Stock Units                                                                                        |           |                     |   |   |
| **Stock Options**                                                                                             |           |                     |   |   |
| Unrecognized compensation cost as of balance sheet date                                                       |           | $ 110,000,000            |   |   |
| **Restricted Stock Awards and Units**                                                                         |           |                     |   |   |
| Granted (USD per share) | $ / shares                                                                          |           | $ 40.56                  | $ 57.37 | $ 69.67 |
| Total fair value of RSA and RSU vested                                                                        |           | $ 100,000,000            | $ 72,000,000 | $ 60,000,000 |
| Unrecognized compensation cost as of balance sheet date                                                       |           | $ 110,000,000            |   |   |
| Weighted average period of unrecognized compensation cost expected to recognize (in years)                    |           | 2 years                  |   |   |
| Restricted Stock Units | Maximum                                                                              |           |                     |   |   |
| **Restricted Stock Awards and Units**                                                                         |           |                     |   |   |
| Vesting period of restricted awards/units (in years)                                                          |           | 3 years                  |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Vesting period of employee contributions (in years)                                                           |           | 3 years                  |   |   |
| Restricted Stock Units | Minimum                                                                              |           |                     |   |   |
| **Restricted Stock Awards and Units**                                                                         |           |                     |   |   |
| Vesting period of restricted awards/units (in years)                                                          |           | 1 year                   |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Vesting period of employee contributions (in years)                                                           |           | 1 year                   |   |   |
| Employee Stock Purchase Plan                                                                                  |           |                     |   |   |
| **Stock-Based Compensation**                                                                                  |           |                     |   |   |
| Shares authorized for issuance (in shares) | shares                                                           |           | 30,500,000               |   |   |
| Shares available for issuance (in shares) | shares                                                            |           | 2,700,000                |   |   |
| **Restricted Stock Awards and Units**                                                                         |           |                     |   |   |
| Vesting period of restricted awards/units (in years)                                                          |           | 6 months                 |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Minimum employee subscription rate for employee stock purchase plan (as a percentage)                         |           | 1.00%                    |   |   |
| Maximum employee subscription rate for employee stock purchase plan (as a percentage)                         |           | 10.00%                   |   |   |
| Percentage discount on fair market value of common stock under employee stock purchase plan (as a percentage) | 15.00%         | 15.00%                   |   |   |
| Vesting period of employee contributions (in years)                                                           |           | 6 months                 |   |   |
| Shares authorized for issuance (in shares) | shares                                                           |           | 30,500,000               |   |   |
| Shares available for issuance (in shares) | shares                                                            |           | 2,700,000                |   |   |
| Employee Stock Purchase Plan | June 30 of each year                                                           |           |                     |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Maximum amount contributable by employees under ESPP                                                          |           | $ 5,000                  |   |   |
| Employee Stock Purchase Plan | December 31 of each year                                                       |           |                     |   |   |
| **Employee Stock Purchase Plan**                                                                              |           |                     |   |   |
| Maximum amount contributable by employees under ESPP                                                          |           | $ 10,000                 |   |   |

| X                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expiration from date of grant
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum amount contributable by employees under ESPP.
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| X                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of annual installment payments
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| X                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Quoted price of common stock to calculate intrinsic value of stock option.
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| X                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate number of common shares reserved for future issuance.
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| - Definition
Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
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| - Definition
Unrecognized cost of unvested share-based compensation awards.
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| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Discount rate from fair value on purchase date that participants pay for shares.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
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| - Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.
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| - Definition
The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.
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| - Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).
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| - Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
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| - Definition
Gross number of share options (or share units) granted during the period.
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| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.
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| - Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.
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| - Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Weighted average remaining contractual term for option awards outstanding, 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 of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.
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