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Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | $ (316) | $ 292 | $ (155) | $ 656
Other comprehensive income (loss) before reclassifications |  |  | 5 | (71)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 21 | 5
Other comprehensive income (loss) | 2 | 33 | 26 | (66)
Ending Balance | 92 | (153) | 92 | (153)
Foreign exchange contracts | Derivatives designated as hedging instruments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Derivatives used in net investment hedge, net of tax | 37 |  | 37 |
Currency Translation Adjustments (a) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | 40 | 9
Other comprehensive income (loss) before reclassifications |  |  | (10) | (44)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 11 | 0
Other comprehensive income (loss) |  |  | 1 | (44)
Ending Balance | 41 | (35) | 41 | (35)
Net Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (51) | (20)
Other comprehensive income (loss) before reclassifications |  |  | 14 | (28)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 7 | 2
Other comprehensive income (loss) |  |  | 21 | (26)
Ending Balance | (30) | (46) | (30) | (46)
Net Unrealized Gains (Losses) on Cash Flow Hedges | Corporate Interest Expense |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 3 | 1 | 6 | 1
Reclassification before tax | 4 | 2 | 8 | 1
Net Unrealized Gains (Losses) on Cash Flow Hedges | Vehicle Interest Net |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 1 |  | 1 |
Reclassification before tax | 1 |  | 2 |
Minimum Pension Liability Adjustment |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (176) | (146)
Other comprehensive income (loss) before reclassifications |  |  | 1 | 1
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 3 | 3
Other comprehensive income (loss) |  |  | 4 | 4
Ending Balance | (172) | (142) | (172) | (142)
Minimum Pension Liability Adjustment | Selling, General and Administrative Expenses |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 1 | 2 | 3 | 3
Reclassification before tax | 2 | 2 | 5 | 4
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance | (163) | (256) | (187) | (157)
Other comprehensive income (loss) | 2 | 33 | 26 | (66)
Ending Balance | $ (161) | $ (223) | $ (161) | $ (223)

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