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Segments - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 4,274 | $ 4,243 | $ 4,193 | $ 4,119 | $ 4,664 | $ 4,697 | $ 4,883 | $ 4,646 | $ 16,829 | $ 18,890 | $ 19,883
Margin | 578 | $ 561 | $ 583 | $ 581 | 664 | $ 566 | $ 673 | $ 615 | 2,303 | 2,518 | 1,810
Goodwill and intangible assets, net | 172 |  |  |  | 190 |  |  |  | 172 | 190 | 255
Total assets | 6,787 |  |  |  | 7,154 |  |  |  | 6,787 | 7,154 | 8,471
Health Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 16,815 | 18,471 | 19,352
Goodwill and intangible assets, net | 172 |  |  |  | 190 |  |  |  | 172 | 190 | 212
Total assets | 5,265 |  |  |  | 6,165 |  |  |  | 5,265 | 6,165 | 6,347
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 14 | 419 | 531
Margin |  |  |  |  |  |  |  |  | 0 | 43 | 29
Goodwill and intangible assets, net | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 43
Total assets | $ 1,522 |  |  |  | $ 989 |  |  |  | $ 1,522 | $ 989 | $ 2,124

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