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Taxation - Additional Information (Details) R$ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Effective tax rate | (1.30%) | (0.80%) | (0.10%) | 3.10% |  |
Tax benefit, CARES Act |  |  | $ 5 |  |  |
Deferred tax assets, net operating loss carry forwards |  |  | 251 | $ 259 |  |
Deferred tax assets not subject to expiration |  |  | 241 | 249 |  |
Deferred tax assets subject to expiration |  |  | 10 | 10 |  |
Deferred tax liabilities, intangibles |  |  | 0 | 4 |  |
Unrecognized tax benefits | $ 132 | $ 61 | 82 | 89 |  | $ 55
Accrued interest and penalties |  |  | 18 | 18 |  |
Interest and penalties expense (benefit) | $ 11 | $ 3 | 1 | 7 |  |
Unrecognized tax benefits that would have a favorable impact on effective tax rate |  |  | 79 |  |  |
Cash collateral posted |  |  | 197 | 242 |  |
Demand deposit pledged as collateral for tax related guarantee |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash collateral posted |  |  | 65 | $ 83 | R$ 330 |
Secretariat of the Federal Revenue Bureau of Brazil |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income tax examination, estimate of possible loss |  |  | 161 |  |  |
Nigeria |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Income tax examination, estimate of possible loss |  |  | 171 |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Unrecognized tax benefits |  |  | 61 |  |  |
Deferred Tax Asset Reduction |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Unrecognized tax benefits |  |  | $ 21 |  |  |

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