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Stock Plans - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 29, 2015 | Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |  |  |
Cost of shares repurchased |  |  | $ 1,817,000,000 |  | $ 2,601,000,000 |
Repurchase of Common Stock |  |  | $ 1,786,000,000 | $ 1,727,000,000 |  |
Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased |  |  | 42 |  |  |
Average cost of shares repurchased |  |  | $ 43.67 |  |  |
Cost of shares repurchased |  |  | $ 1,817,000,000 |  |  |
Stock repurchase remaining amount |  |  | 1,000,000,000 |  |  |
Common Class A | Share Repurchase Program amended July 29, 2015 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase value | $ 13,700,000,000 |  |  |  |  |
Increase in share repurchase value | $ 6,000,000,000 |  |  |  |  |
Stock repurchase expiration date | Dec. 31, 2018 |  |  |  |  |
Common Class A | Prior to January 1, 2016 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase value |  |  | $ 10,800,000,000 |  |  | $ 7,700,000,000
Subsequent Event | Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of Common Stock |  | $ 31,000,000 |  |  |  |

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