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Income Taxes - Summary of Tax Loss and Tax Credits (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Tax Loss Carry Forwards [Member] |
Disclosure of Income Taxes [Line Items] |
2021 | $ 93
2022 | 312
2023 | 475
2024 | 524
2025 and thereafter | 14,897
Tax Loss And Tax Credits, Total | 16,301
Amount of unrecognized carryforwards [Member] |
Disclosure of Income Taxes [Line Items] |
2021 | 81
2022 | 289
2023 | 454
2024 | 234
2025 and thereafter | 12,078
Tax Loss And Tax Credits, Total | 13,136
Amount of recognized carryforwards [Member] |
Disclosure of Income Taxes [Line Items] |
2021 | 12
2022 | 23
2023 | 21
2024 | 290
2025 and thereafter | 2,819
Tax Loss And Tax Credits, Total | $ 3,165

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