v3.20.4

Income Taxes - Expiration of Tax Loss Carryforwards (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | $ 737
Disallowed interest carryforward | (276)
2020 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 737
2021 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 0
2022 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 12
2023 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 2
2024 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 3
2025 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 81
2026-2030 Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 160
Later Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | 70
Unlimited Tax Loss Carryforwards |
Operating Loss Carryforwards [Line Items] |
Tax loss carryforwards | $ 409

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