v3.10.0.1

Income Taxes - Expiration of Tax Loss Carryforwards (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 795
2019 Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	22
2020 Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	6
2021 Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	1
2022 Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	16
2023 Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	3
2024-2028 Tax Loss Credit Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	129
Later Tax Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	181
Unlimited Tax Credit Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 437

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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