v3.6.0.2

Provision for Income Taxes - Expiration of Tax Credit Carryforwards (Detail) $ in Millions | Dec. 31, 2016 USD ($)
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Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 749
2017 Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 1
2018 Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 8
2019 Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 12
2020 Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 32
2021 Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 18
2022-2026 Tax Loss Credit Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 336
Later Tax Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 282
Unlimited Tax Credit Loss Carryforwards [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 60

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- Definition The amount of the tax credit 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=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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