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Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Equity [Abstract] |  |
Net loss | $ (91) | $ (87)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Document Fiscal Year Focus | 2019 |
Currency translation adjustments (net of tax of $(6) and $5, respectively) | $ 1 | 1
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 and $0, respectively) | 0 | 0
Net unrealized gain (loss) on cash flow hedges (net of tax of $3 and $(2), respectively) | (8) | 6
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 2 | 1
Other comprehensive income (loss) | (5) | 8
Total comprehensive income (loss) | $ (96) | (79)
Document Period End Date | Mar. 31, 2019 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | $ (1) | 0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | (6) | 5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 3 | (2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax | 0 | $ (1)
Corporate Interest Expense [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 2 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 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 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 1 |

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