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Debt - Convertible Senior Notes due in 2021 Narrative (Details) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2021 USD ($) shares | May 19, 2020 USD ($) | Oct. 09, 2019 USD ($) | Sep. 09, 2019 USD ($) | Dec. 12, 2016 USD ($) | Dec. 31, 2022 USD ($) day | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | May 15, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance |  |  |  |  |  | $ 0 | $ 0 | $ 553,000,000 |  |
Shareholders equity |  |  |  |  |  | 4,482,000,000 | 5,341,000,000 | 4,742,000,000 |  | $ 3,435,000,000
Capped call confirmations, portion unwound, value received | $ 43,000,000 |  |  |  |  |  |  | 15,000,000 |  |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shareholders equity |  |  |  |  |  | (1,612,000,000) | (1,667,000,000) | $ (1,139,000,000) |  | $ (977,000,000)
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shareholders equity |  |  |  |  |  |  | (336,000,000) |  |  |
Cumulative-effect adjustment from adoption of guidance on accounting for convertible instruments and contracts in an entity’s own equity | Accumulated Deficit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Shareholders equity |  |  |  |  |  |  | $ 156,000,000 |  |  |
Class C capital stock |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capped call confirmations, portion unwound, shares received (in shares) | shares | 700,000 |  |  |  |  |  |  | 300,000 |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,672,000,000 |  |  |  |
Convertible Senior Notes due 2021, 2.0% | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 460,000,000 |  |  |  |  |
Debt instrument, interest rate stated percentage |  |  |  |  | 2.00% |  |  |  |  |
Net proceeds from issuance |  |  |  |  | $ 448,000,000 |  |  |  |  |
Net proceeds used to purchase capped call confirmations |  |  |  |  | 37,000,000 |  |  |  |  |
2.0% convertible senior notes due 2021, over-allotment option | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 60,000,000 |  |  |  |  |
Convertible Senior Notes Due 2024, 2025, 2026 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase price percentage of principal amount |  |  |  |  |  | 100.00% |  |  |  |
Debt instrument, convertible threshold percentage |  |  |  |  |  | 130.00% |  |  |  |
Debt instrument, convertible threshold trading days | day |  |  |  |  |  | 20 |  |  |  |
Debt instrument, threshold consecutive trading days | day |  |  |  |  |  | 30 |  |  |  |
1.375% convertible senior notes due 2026 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 500,000,000 |  | $ 499,000,000 |  |  |  |
Debt instrument, interest rate stated percentage |  |  |  |  |  | 1.375% |  |  |  |
Net proceeds from issuance |  |  |  | 494,000,000 |  |  |  |  |  |
Net proceeds used to purchase capped call confirmations |  |  |  | 75,000,000 |  |  |  |  |  |
2.75% convertible senior notes due 2025 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 65,000,000 |  |  |  | $ 565,000,000 |  |  | $ 500,000,000 |
Debt instrument, interest rate stated percentage |  | 2.75% |  |  |  | 2.75% |  |  | 2.75% |
Net proceeds from issuance |  | $ 553,000,000 |  |  |  |  |  |  |  |
0.75% convertible senior notes due 2024 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 73,000,000 | 600,000,000 |  | $ 608,000,000 |  |  |  |
Debt instrument, interest rate stated percentage |  |  | 0.75% |  |  | 0.75% |  |  |  |
Net proceeds from issuance |  |  | $ 72,000,000 | 592,000,000 |  |  |  |  |  |
Net proceeds used to purchase capped call confirmations |  |  | $ 9,000,000 | $ 75,000,000 |  |  |  |  |  |

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