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Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |
Net income (loss) | $ 26 | $ 3 | $ (61) | $ (104)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Document Fiscal Year Focus |  |  | 2018 |
Currency translation adjustments (net of tax of $(10), $17, $(5) and $20, respectively) | (54) | 48 | $ (53) | 73
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 in each period) | 0 | 1 | 0 | 1
Net unrealized gain (loss) on cash flow hedges (net of tax of $(1), $1, $(3) and $1, respectively) | 2 | (2) | 8 | (1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 2 | 1 | 3 | 3
Other comprehensive income (loss) |  |  | (42) | 76
Total comprehensive income (loss) | (24) | 51 | $ (103) | (28)
Document Period End Date |  |  | Jun. 30, 2018 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | $ 0 | 1
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | (10) | 17 | (5) | 20
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (1) | 1 | (3) | 1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | 0 | 0 | (1) | (1)
Corporate Interest Expense [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  | 1 |  | 2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | 0 |  | 1
Selling, General and Administrative Expenses [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2 | 2 | 4 | 4
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 1 | 2 | 2 | 3
Including Beginning Balance Adjustment due to Cumulative Effect of Accounting Change [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) | $ (50) | $ 48 | $ (42) | $ 76

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