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Income Taxes (Narrative) (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
Income Taxes [Line Items] |
Bonus Depreciation For Tax Purposes | 50.00%
Bonus Depreciation for Tax Purposes 2018 | 40.00%
Bonus Depreciation for Tax Purposes 2019 | 30.00%
Current ITC rate for qualified property | 30.00%
2020 ITC rate for qualified property | 26.00%
2021 ITC rate for qualified property | 22.00%
Long production property [Member] |
Income Taxes [Line Items] |
Bonus Depreciation for Tax Purposes 2018 | 50.00%
Bonus Depreciation for Tax Purposes 2019 | 40.00%
Minimum [Member] |
Income Taxes [Line Items] |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 80
Maximum [Member] |
Income Taxes [Line Items] |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 180

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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