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Stockholders' Equity (Narrative) (Detail) - USD ($) shares in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Feb. 10, 2021 | Sep. 30, 2021 | Aug. 31, 2021
Equity [Abstract] |  |  |
Stock repurchase program, authorized amount (up to) |  |  | $ 3,100,000,000
Net activity related to restricted stock units (in shares) |  | 11.7 |
Share repurchased during period |  | $ 1,000,000,000 |
Remaining authorized repurchase amount |  | $ 397,000,000 |
Board of Directors Chairman |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Shares issued (in shares) | 15.0 |  |

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