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Stockholders' Equity - Additional Information (Detail) shares in Millions, $ in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) shares
Stockholders Equity [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 1,800 |  |  | $ 1,800
Treasury Stock, Shares, Acquired | shares |  |  |  | 13.0
Treasury Stock, Value, Acquired, Cost Method | 113 | $ 62 | $ 200 | $ 375
Option Premiums Paid |  | 16 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 76 |  |  | $ 76
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 8 | (3) | (2) |
Less: Pension and post-retirement benefits reclassified to earnings, net of tax of $(2), $(1) and $(6), respectively | (6) | $ (6) | (5) |
Open Option Contracts Written, Number of Shares | shares |  | 0.6 |  |
Proceeds from Issuance of Common Stock | 15 | $ 0 | 0 |
Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (67) | 17 | 24 |
Corporate Interest Expense [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 9 | 4 | 3 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | $ 6 | $ 3 | $ 2 |

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