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Segments - Reconciliation of Gross Margin to Consolidated Income (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 margin | $ 578 | $ 561 | $ 583 | $ 581 | $ 664 | $ 566 | $ 673 | $ 615 | $ 2,303 | $ 2,518 | $ 1,810
Add: Other operating revenues | $ 4,274 | $ 4,243 | $ 4,193 | $ 4,119 | 4,664 | 4,697 | 4,883 | 4,646 | 16,829 | 18,890 | 19,883
Less: Other operating expenses |  |  |  |  |  |  |  |  | (15,785) | (17,744) | (20,438)
Less: loss on sales of subsidiaries, net of gain |  |  |  |  | $ (52) | $ 37 | $ 0 | $ 0 | 0 | (15) | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 1,044 | 1,131 | (555)
Less: other expenses, net |  |  |  |  |  |  |  |  | 72 | 132 | 57
Income (loss) before income tax expense (benefit) |  |  |  |  |  |  |  |  | 972 | 999 | (612)
Health Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Add: Other operating revenues |  |  |  |  |  |  |  |  | 16,815 | 18,471 | 19,352
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total margin |  |  |  |  |  |  |  |  | 0 | 43 | 29
Add: Other operating revenues |  |  |  |  |  |  |  |  | 14 | 419 | 531
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total margin |  |  |  |  |  |  |  |  | 2,303 | 2,518 | 1,810
Operating Segments | Health Plans |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total margin |  |  |  |  |  |  |  |  | 2,303 | 2,475 | 1,781
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total margin |  |  |  |  |  |  |  |  | 0 | 43 | 29
Other Operating |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Add: Other operating revenues |  |  |  |  |  |  |  |  | 621 | 871 | 508
Less: Other operating expenses |  |  |  |  |  |  |  |  | (1,880) | (2,243) | (2,873)
Less: loss on sales of subsidiaries, net of gain |  |  |  |  |  |  |  |  | $ 0 | $ (15) | $ 0

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