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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 29, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |
Cost of shares repurchased |  | $ 1,187,000,000 | $ 3,622,000,000 |
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase expiration date | Dec. 31, 2018 |  |  | Dec. 31, 2016
Stock repurchase value | $ 13,700,000,000 |  |  | $ 7,700,000,000
Increase in share repurchase value | $ 6,000,000,000 |  |  |
Number of shares repurchased |  | 28.9 |  |
Average cost of shares repurchased |  | $ 41.04 |  |
Cost of shares repurchased |  | $ 1,200,000,000 |  |
Stock repurchase remaining amount |  | $ 4,300,000,000 |  |

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