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Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Equity [Abstract] |  |  |  |
Net income (loss) | $ 3 | $ 36 | $ (104) | $ (15)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2017 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | $ 1 | 2
Document Fiscal Year Focus |  |  | 2017 |
Currency translation adjustments (net of tax of $17, $(5), $20 and $4, respectively) | 48 | 8 | $ 73 | 80
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 in each period) | 1 | 0 | 1 | 0
Net unrealized gain (loss) on cash flow hedges (net of tax of $1, $3, $1 and $5, respectively) | (2) | (5) | (1) | (8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 1 | 1 | 3 | 2
Other comprehensive income (loss) | 48 | 4 | 76 | 74
Total comprehensive income (loss) | 51 | 40 | (28) | 59
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax | 0 | 0 | 0 | 0
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 | 2 | 4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 1 | 1 | 2
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 | 3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 2 | $ 1 | $ 3 | $ 2

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