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Common Stock (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Nov. 30, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock repurchased (in shares) |  | 0 |
Purchase of treasury shares | $ 734,000,000 |  |
Stock-based compensation, shares issued during period (in shares) | 3,100,000 | 3,400,000 |
Common Stock |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Share repurchases program, authorized amount (up to) |  |  | $ 2,500,000,000
Common stock repurchased (in shares) | 5,300,000 |  |
Stock repurchase program, remaining authorized repurchase amount | $ 1,700,000,000 |  |

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