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Stockholders' Equity (Narrative) (Detail) $ / shares in Units, shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($)
Stockholders Equity [Line Items] |  |  |  |
Currency translation adjustments (net of tax of $12, $(12), $12, and $(14), respectively) | $ 35,000,000 | $ (31,000,000) | $ (9,000,000) | $ (21,000,000)
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | (38,000,000) | (23,000,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | 5,000,000 | (2,000,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (33,000,000) | $ (25,000,000)
Option Premiums Paid |  | 16,000,000 |  |
Stockholders' Equity Note [Abstract] |  |  |  |
Option Premiums Paid |  | $ 16,000,000 |  |
Open Option Contracts Written, Number of Shares |  | 600,000 |  | 600,000
Stock Repurchase Program, Authorized Amount | 1,800,000,000 |  | $ 1,800,000,000 |
Stock Repurchased During Period, Shares | shares |  |  | 5.0 |
Stock Repurchased During Period, Value |  |  | $ 113,000,000 |
Stock Repurchased During Period, Average Price | $ / shares |  |  | $ 22.49 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 76,000,000 |  | $ 76,000,000 |
Proceeds from Issuance of Common Stock |  |  | $ 15,000,000 | $ 0
Additional Paid-in Capital [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Option Premiums Paid |  | $ 16,000,000 |  | (16,000,000)
Stockholders' Equity Note [Abstract] |  |  |  |
Option Premiums Paid |  | $ 16,000,000 |  | $ (16,000,000)

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