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Equity - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Stock repurchase program, remaining authorized repurchase amount |  | $ 3,020 |  | $ 3,020 |
Number of shares repurchased |  | 10,000,000 | 5,000,000 | 33,000,000 | 36,000,000
Cash paid for shares repurchased |  | $ 500 | $ 400 | $ 1,885 | $ 2,612
Forecast |  |  |  |  |
Number of shares repurchased | 97,078 |  |  |  |
Cash paid for shares repurchased | $ 6 |  |  |  |

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