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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 72 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Jul. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common shares repurchased |  |  | $ 276,000,000 | $ 650,000,000 | $ 941,000,000 | $ 1,150,000,000 |  |
Repurchase of common stock |  |  |  |  | 940,000,000 | $ 1,177,000,000 |  |
Common Stock | Prior to January 1, 2018 |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  |  |  | $ 13,700,000,000
Common shares repurchased |  |  |  |  |  |  | $ 15,000,000,000.0 |
Common Stock | Share Repurchase Program Amended January 1, 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 |  |  |  |  | $ 1,000,000,000.0 |  |  |
Number of shares repurchased (in shares) |  |  |  |  | 21 |  |  |
Average cost of shares repurchased (in dollars per share) |  |  |  |  | $ 45.84 |  |  |
Remaining share repurchase capacity |  |  | $ 3,700,000,000 |  | $ 3,700,000,000 |  |  |
Common Stock | Share Repurchase Program Amended January 1, 2018 | Subsequent Event |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Repurchase of common stock |  | $ 1,000,000 |  |  |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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