Debt - Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Debt instrument, repurchased face amount		$ 160
Gain due to exchange of principal amount	$ 64
Senior notes
Debt Instrument [Line Items]
Debt instrument, repurchased face amount	82	160
Debt repurchased, principal	76	95
Gain on repurchase of debt	6	65
Exchanged principal amount	$ 507
Number of shared exchanged for principal amount of debt (in shares)	235,563,519
Senior notes \| 6.625% senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, repurchased face amount		$ 32
Interest rate, stated percentage		6.625%
Senior notes \| 6.875% senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, repurchased face amount		$ 20
Interest rate, stated percentage	6.875%	6.875%
Senior notes \| 4.875% senior notes due 2022
Debt Instrument [Line Items]
Debt instrument, repurchased face amount		$ 66
Interest rate, stated percentage		4.875%
Senior notes \| 5.375% senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, repurchased face amount		$ 42
Interest rate, stated percentage		5.375%
Convertible senior notes
Debt Instrument [Line Items]
Exchanged principal amount	$ 186
Number of shared exchanged for principal amount of debt (in shares)	73,389,094

Debt Instrument, Exchanged Principal Amount

No definition available.

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- Definition

Debt Instrument, Gain (Loss) due to Exchange of Principal Amount

+ References

No definition available.

+ Details

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- Definition

Number of Shared Exchanged for Principal Amount of Debt

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

No definition available.

+ Details

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