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Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stockholders Equity [Line Items] |  |  |  |
Currency Translation Adjustments, Balance |  |  | $ 9 | $ (3)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance | $ (46) | $ (18) | (46) | (18)
Currency Translation Adjustments, Balance |  |  | (146) | (132)
Accumulated Other Comprehensive Income, Balance |  |  | (157) | (133)
Currency Translation Adjustments, Current period change | 39 | 9 | (44) | 10
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (8) | (13) | (26) | (21)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (2) | (2) | (4) | (4)
Other comprehensive income (loss) | 33 | (2) | (66) | (7)
Currency Translation Adjustments, Balance | (35) | 7 | (35) | 7
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | (20) | 2
Currency Translation Adjustments, Balance | (142) | (128) | (142) | (128)
Accumulated Other Comprehensive Income, Balance | (223) | (139) | (223) | (139)
Derivatives used in Net Investment Hedge, Net of Tax | 79 |  | 79 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  |  | (44) | 10
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | (28) | (19)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (26) | (21)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax |  |  | 3 | 3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (71) | (8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 5 | 1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | 0 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | (2) | 2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  |  | 1 | 1
Corporate Interest Expense [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2 | 1 | 1 | 3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 1 | 1 | 1 | 2
Selling, General and Administrative Expenses [Member] |  |  |  |
Stockholders Equity [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 | 2 | $ 2 | 3 | 3
Vehicle Interest Net [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2 |  | 1 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 1 |  | $ 1 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Currency Translation Adjustments, Balance |  |  |  | (3)
Currency Translation Adjustments, Balance |  |  |  | (132)
Accumulated Other Comprehensive Income, Balance |  |  |  | (132)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  |  | 3
Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Currency Translation Adjustments, Balance |  |  |  | 0
Currency Translation Adjustments, Balance |  |  |  | 0
Accumulated Other Comprehensive Income, Balance |  |  |  | 1
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  |  | $ 1

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