| **Debt - Narrative (Details)In Millions, except Share data, unless otherwise specified**                         | 3 Months Ended |           |        | 1 Months Ended | 3 Months Ended |        | 1 Months Ended | 3 Months Ended |        |        |        | 3 Months Ended |        | 3 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |            |        |
|------------------------------------------------------------------------------------------------------------------|----------------|-----------|--------|----------------|----------------|--------|----------------|----------------|--------|--------|--------|----------------|--------|----------------|----------------|----------------|----------------|------------|--------|
||
| **Debt Instrument [Line Items]**                                                                                 |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Basis Spread on Variable Rate                                                                   |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   | 1.75% | 2.25% | 2.75% | 3.25% |   |   |   |
| Debt Instrument, Face Amount                                                                                     |           |      | $ 500  | $ 21           |           |   |           |           | $ 411  |   | $ 570  |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Interest Rate, Stated Percentage                                                                |           |      |   |           |           |   |           |           | 4.75%  |   |   |           |   | 8.25%          |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Proceeds from Issuance of Senior Long-term Debt                                                                  |           |      |   |           |           |   |           |           | 402    |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Related Commitment Fees and Debt Issuance Costs                                                             |           |      |   |           |           |   |           |           | 9      |   |   |           |   |           |           |           |           |       |   |   | 8 | 1 |   |   |   |   |   |   |   |
| Debt Instrument, Unamortized Discount                                                                            |           |      |   |           |           |   |           |           |   |   |   |           |   | 21             | 22             |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Long-term Debt, Fair Value                                                                                       |           |      |   |           |           |   |           |           |   | 367    |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Carrying Amount of Equity Component                                                |           |      |   |           |           |   |           |           |   | 44     |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                                        |           |      |   |           |           |   |           | 130.00%        |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Threshold Trading Days                                                             |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           | 20             |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Threshold Consecutive Trading Days                                                 |           |      |   |           |           |   |           | 30 days        |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Measurement Period, Trading Days, Ending                                           |           |      |   |           |           |   |           | 10             |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Measurement Period, Business Days                                                  |           |      |   |           |           |   |           | 5              |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Redemption Price, Percentage                                                                    |           |      |   |           |           |   |           | 100.00%        |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Option Indexed to Issuer's Equity, Strike Price                                                                  |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       | 54.07  | 50.27 |   |   |   |   |   |   |   |   |   |
| Debt Instrument Convertible Conversion Price Percent                                                             |           |      |   |           |           |   |           | 100.00%        |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Threshold percentage of last reported sale price of common stock                                                 |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           | 98.00%         |       |   |   |   |   |   |   |   |   |   |   |   |
| Debt Instrument, Convertible, Conversion Ratio                                                                   |           |      |   |           |           |   | 18.4946        |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Proceeds from Issuance of Warrants                                                                               |           |      |   |           |           |   |           |           |   |   | 87     |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Payments for Derivative Instrument, Investing Activities                                                         |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   | 125 |   |   |   |   |   |   |   |   |   |
| Option Indexed to Issuer's Equity, Indexed Shares                                                                |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           | 11,337,870 |   | 11,337,870 |   |   |   |   |   |   |   |   |   |
| Class of Warrant or Right, Exercise Price of Warrants or Rights                                                  |           |      |   |           |           |   |           |           |   |   | 60.14  |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Repayments of Long-term Debt                                                                                     |           |      |   |           |           |   |           |           |   |   |   | 404            |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Shares of Call Options Unwound                                                                                   |           | 8,026,456 |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Shares of Warrants Unwound                                                                                       | 6,523,319      | 6,523,319 |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Maximum Borrowing Capacity                                                              |           |      |   |           |           |   |           |           |   |   |   |           | 175    |           |           |           |           |       |   |   |   |   |   |   |   |   | 100 |   | 40 |
| Cash Dividends Paid to Parent Company by Consolidated Subsidiaries                                               | 30             |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Line of Credit Facility, Participation Fee Reduction, Amount Outstanding in Excess of Maximum Borrowing Capacity |           |      |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   | 50 |   |
| Charge Related to Repurchase of Debt                                                                             |           | 11        |   |           |           |   |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |
| Proceeds from Issuance of Debt                                                                                   |           |      |   |           | $ 61           | 800    |           |           |   |   |   |           |   |           |           |           |           |       |   |   |   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Charge Related to Repurchase of Debt
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Debt Instrument Convertible Conversion Price Percent
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| - Definition
Debt Instrument, Convertible, Measurement Period, Business Days
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Debt Instrument, Convertible, Measurement Period, Trading Days, Ending
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| - Definition
Line of Credit Facility, Participation Fee Reduction, Amount Outstanding in Excess of Maximum Borrowing Capacity
+ References
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| - Definition
Shares of Call Options Unwound
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| - Definition
Shares of Warrants Unwound
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| X                                                                                                                                                                                                                                                                                                      |
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| - Definition
Threshold percentage of last reported sale price of common stock
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exercise price per share or per unit of warrants or rights outstanding.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.
+ References
No definition available.
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| - Definition
Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face (par) amount of debt instrument at time of issuance.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the charge against earnings during the period for commitment fees and debt issuance expenses.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
+ References
No definition available.
+ Details**Name:**us-gaap_LongTermDebtFairValue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of issuer's shares to which the option contract is indexed.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The exercise (or strike) price stated in the contract. The fixed price at which the option holder can purchase, in the case of a call option, or sell, in the case of a put option, on the underlying security.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.
+ References
No definition available.
+ Details**Name:**us-gaap_PaymentsForDerivativeInstrumentInvestingActivities**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.
+ References
No definition available.
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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).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228
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