v3.20.4

Income Taxes - Expiration of Tax Loss Carryforwards (Detail) $ in Millions	Dec. 31, 2020 USD ($)
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

X

- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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+ References

No definition available.

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