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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Rollforward Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill Activity |  |  |  |  |  |
As of beginning of period |  |  |  |  | $ 12,657 |
Impairment | $ 0 | $ (8,800) |  | $ 0 | (8,793) | $ 0
As of end of period | 3,864 |  | $ 12,657 |  | 3,864 |
Accumulated impairment losses | 19,800 |  | 11,000 |  | 19,800 |
Business |  |  |  |  |  |
Goodwill Activity |  |  |  |  |  |
As of beginning of period |  |  |  |  | 7,906 |
Impairment |  |  |  |  | (6,580) |
As of end of period | 1,326 |  | 7,906 |  | 1,326 |
Mass Markets |  |  |  |  |  |
Goodwill Activity |  |  |  |  |  |
As of beginning of period |  |  |  |  | 4,751 |
Impairment |  |  |  |  | (2,213) |
As of end of period | $ 2,538 |  | $ 4,751 |  | $ 2,538 |

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