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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 |

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- Definition Debt Instrument, Exchanged Principal Amount + References No definition available. + Details
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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 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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