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Benefit Plans - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | $ 58 | $ 65 | $ 165 | $ 192 |
Share-based payment expense |  |  | $ 165 | 192 |
Acquisition-related Costs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense |  |  |  | 21 |
Employees and Non Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant date fair value of options (USD per share) |  |  | $ 1.42 |  |
Options exercised in period, intrinsic value |  |  | $ 53 | 83 |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  | 5 |  |
Share-based payment expense | 11 | 14 | $ 34 | 49 |
Restricted Stock Units (RSUs) and Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment expense | 47 | $ 51 | 131 | 143 |
Restricted stock units vested, intrinsic value |  |  | $ 168 | $ 192 |
Granted (in shares) |  |  | 33 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise of stock options and vesting of restricted stock units (in shares) |  |  | 17 |  |
Performance-based Share Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 3 |  |
Restricted Stock Units Rsu And Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs | $ 418 |  | $ 418 |  | $ 415
Weighted-average service period (in years) |  |  | 2 years 8 months 12 days |  |
Maximum | Restricted Stock Units (RSUs) and Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units granted (in shares) |  |  | 1 |  |

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