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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  |  | 3 Months Ended | 9 Months Ended | 96 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 02, 2020 | Jan. 31, 2018 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Common shares repurchased |  |  | $ 326,000,000 | $ 1,794,000,000 | $ 701,000,000 |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  |  | $ 13,700,000,000
Common shares repurchased |  |  |  | $ 1,800,000,000 |  |  |
Number of shares repurchased (in shares) |  |  |  | 31.0 |  |  |
Average cost of shares repurchased (in dollars per share) |  |  |  | $ 58.72 |  |  |
Remaining share repurchase capacity |  |  | $ 4,000,000,000 | $ 4,000,000,000 |  |  |
Common Stock | Share Repurchase Program Amended January 31, 2018 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase value |  | $ 19,700,000,000 |  |  |  |  |
Increase in share repurchase value |  | $ 6,000,000,000 |  |  |  |  |
Common Stock | Share Repurchase Program Amended December 2, 2020 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase value | $ 23,700,000,000 |  |  |  |  |  |
Increase in share repurchase value | $ 4,000,000,000 |  |  |  |  |  |
Common Stock | Prior to January 1, 2021 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common shares repurchased |  |  |  |  |  | $ 18,000,000,000 |

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