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Equity - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Stock repurchase program, remaining authorized repurchase amount |  | $ 1,860 |
Number of shares repurchased |  | 19,000,000 | 9,000,000
Cash paid for shares repurchased |  | $ 1,327 | $ 420
Scenario, Forecast |  |  |
Number of shares repurchased | 619,415 |  |
Cash paid for shares repurchased | $ 45 |  |

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