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Income Taxes - Summary of Tax Loss and Tax Credits (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
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