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Capital Stock - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized |  | 5,000,000,000 | 5,000,000,000 |
Preferred stock, shares authorized |  | 500,000,000 |  |
Preferred stock, shares issued |  | 0 | 0 | 0
Preferred stock, shares outstanding |  | 0 | 0 | 0
Cost of shares repurchased |  | $ 2,202,000,000 | $ 2,601,000,000 | $ 3,622,000,000
Repurchase of Common Stock |  | $ 2,174,000,000 | $ 2,601,000,000 | $ 3,622,000,000
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock reserved for stock option and other stock awards |  | 123,000,000 |  |
Stock repurchase value |  | $ 13,700,000,000 |  |
Number of shares repurchased |  | 50,598,902 | 61,972,713 | 91,875,878
Average cost of shares repurchased |  | $ 43.51 |  |
Cost of shares repurchased |  | $ 2,200,000,000 |  |
Stock repurchase remaining amount |  | 600,000,000 |  |
Common Class A | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase value | $ 100,000,000 |  |  |
Repurchase of Common Stock | 28,000,000 |  |  |
Stock repurchase remaining amount | 6,500,000,000 |  |  |
Common Class A | Share Repurchase Program amended July 29, 2015 | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase value | 19,700,000,000 |  |  |
Increase in share repurchase value | $ 6,000,000,000 |  |  |
Stock repurchase expiration date | Dec. 31, 2020 |  |  |
Common Class A | Prior to January 1, 2017 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase value |  | $ 10,800,000,000 |  |

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