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Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |
Tax Reform Act Expense | $ (851) | $ 46 | $ (851) | $ 0
Discontinued Operations [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax Reform Act Expense |  | $ 8 | $ 93 |

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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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