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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  | 3 Months Ended | 6 Months Ended | 84 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Common shares repurchased |  | $ 276,000,000 | $ 701,000,000 | $ 941,000,000 |  |
Common Stock | Prior to January 1, 2020 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  | $ 13,700,000,000
Common shares repurchased |  |  |  |  | $ 16,500,000,000 |
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 | $ 6,000,000,000.0 |  |  |  |  |
Stock repurchase expiration date | Dec. 31, 2020 |  |  |  |  |
Common shares repurchased |  |  | $ 700,000,000 |  |  |
Number of shares repurchased (in shares) |  |  | 12.9 |  |  |
Average cost of shares repurchased (in dollars per share) |  |  | $ 54.25 |  |  |
Remaining share repurchase capacity |  |  | $ 2,500,000,000 |  |  |

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