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Goodwill, Customer Relationships and Other Intangible Assets - Rollforward of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | $ 28,031 |  | $ 28,031 |
January 2019 reorganization |  |  |  | 0 |
Effect of foreign currency rate change and other |  |  |  | (18) |
Impairment of goodwill | $ 0 | (6,500) | $ 0 | (6,506) | $ 0
As of September 30, 2019 | 21,507 |  |  | 21,507 |
International and Global Accounts |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | 3,595 |  | 3,595 |
January 2019 reorganization |  |  |  | 0 |
Effect of foreign currency rate change and other |  |  |  | (18) |
Impairment of goodwill |  |  |  | (934) |
As of September 30, 2019 | 2,643 |  |  | 2,643 |
Enterprise |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | 5,222 |  | 5,222 |
January 2019 reorganization |  |  |  | 987 |
Effect of foreign currency rate change and other |  |  |  | 0 |
Impairment of goodwill |  |  |  | (1,471) |
As of September 30, 2019 | 4,738 |  |  | 4,738 |
Small and Medium Business |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | 5,193 |  | 5,193 |
January 2019 reorganization |  |  |  | (1,038) |
Effect of foreign currency rate change and other |  |  |  | 0 |
Impairment of goodwill |  |  |  | (896) |
As of September 30, 2019 | 3,259 |  |  | 3,259 |
Wholesale |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | 6,437 |  | 6,437 |
January 2019 reorganization |  |  |  | 395 |
Effect of foreign currency rate change and other |  |  |  | 0 |
Impairment of goodwill |  |  |  | (3,019) |
As of September 30, 2019 | 3,813 |  |  | 3,813 |
Consumer |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
As of December 31, 2018 |  | $ 7,584 |  | 7,584 |
January 2019 reorganization |  |  |  | (344) |
Effect of foreign currency rate change and other |  |  |  | 0 |
Impairment of goodwill |  |  |  | (186) |
As of September 30, 2019 | $ 7,054 |  |  | $ 7,054 |

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