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Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stockholders Equity [Line Items] |  |  |  |
Currency Translation Adjustments, Balance |  |  | $ 9 | $ (3)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance | $ (53) | $ (22) | (53) | (22)
Currency Translation Adjustments, Balance |  |  | (146) | (132)
Accumulated Other Comprehensive Income, Balance |  |  | (157) | (133)
Currency Translation Adjustments, Current period change | 35 | (31) | (9) | (21)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (7) | (4) | (33) | (25)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (1) | (1) | (5) | (5)
Other comprehensive income (loss) | 29 | (34) | (37) | (41)
Currency Translation Adjustments, Balance | 0 | (24) | 0 | (24)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | (20) | 2
Currency Translation Adjustments, Balance | (141) | (127) | (141) | (127)
Accumulated Other Comprehensive Income, Balance | (194) | (173) | (194) | (173)
Derivatives used in Net Investment Hedge, Net of Tax | 47 |  | 47 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  |  | (9) | (21)
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | (38) | (23)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (33) | (25)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax |  |  | 4 | 4
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (46) | (43)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 9 | 2
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 |  |  | (5) | 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 | 3 | 1 | 5 | 4
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 3 | 0 | 4 | 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 | 6 | 6
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 1 | $ 1 | 4 | 4
Vehicle Interest Net [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 1 |  | 2 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 0 |  | $ 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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