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Segment Information - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 4,664 | $ 4,697 | $ 4,883 | $ 4,646 | $ 4,949 | $ 5,031 | $ 4,999 | $ 4,904 | $ 18,890 | $ 19,883 | $ 17,782
Margin | 664 | $ 566 | $ 673 | $ 615 | 446 | $ 564 | $ 254 | $ 546 | 2,518 | 1,810 | 1,725
Goodwill and intangible assets, net | 190 |  |  |  | 255 |  |  |  | 190 | 255 | 760
Total assets | 7,154 |  |  |  | 8,471 |  |  |  | 7,154 | 8,471 | 7,449
Health Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 18,471 | 19,352 | 17,234
Goodwill and intangible assets, net | 190 |  |  |  | 212 |  |  |  | 190 | 212 | 513
Total assets | 6,165 |  |  |  | 6,347 |  |  |  | 6,165 | 6,347 | 5,897
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 419 | 531 | 548
Margin |  |  |  |  |  |  |  |  | 43 | 29 | 54
Goodwill and intangible assets, net | 0 |  |  |  | 43 |  |  |  | 0 | 43 | 247
Total assets | $ 989 |  |  |  | $ 2,124 |  |  |  | $ 989 | $ 2,124 | $ 1,552

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