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Stock Plans - Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |
Common shares repurchased |  |  | $ 1,636,000,000 |  | $ 2,202,000,000 |  |
Payments for Repurchase of Common Stock |  |  | $ 1,650,000,000 | $ 1,786,000,000 |  |  |
Common Stock | Prior to January 1, 2018 |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  |  | $ 13,700,000,000
Common shares repurchased |  |  |  |  |  | $ 13,000,000,000.0 |
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 |  |  |  |
Number of shares repurchased (in shares) |  |  | 39 |  |  |  |
Average cost of shares repurchased (in dollars per share) |  |  | $ 41.98 |  |  |  |
Common shares repurchased |  |  | $ 1,700,000,000 |  |  |  |
Stock repurchase remaining amount |  |  | $ 5,000,000,000.0 |  |  |  |
Common Stock | Share Repurchase Program Amended January 1, 2018 | Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 12,000,000 |  |  |  |  |

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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=109223946&loc=d3e3291-108585 + Details
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