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Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) member State | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) member State Segment | Jun. 30, 2017 USD ($)
Basis Of Presentation [Line Items] |  |  |  |
Number of reportable segments (in segment) | Segment |  |  | 3 |
Health Plans |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Number of states in which entity operates (in state) | State | 13 |  | 13 |
Number of members eligible for the health care programs, approximately (in member) | member | 4,100,000 |  | 4,100,000 |
Minimum contract terms |  |  | 3 years |
Maximum contract terms |  |  | 5 years |
Puerto Rico |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Number of members served, approximately (in member) | member | 326,000 |  | 326,000 |
Florida |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Number of members served, approximately (in member) | member | 96,000 |  | 96,000 |
Washington |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Number of members served, approximately (in member) | member | 742,000 |  | 742,000 |
Health Care, Premium |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Revenue | $ | $ 4,514 | $ 4,740 | $ 8,837 | $ 9,388
Health Care, Premium | Puerto Rico | Health Plans |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Revenue | $ |  |  | 370 |
Health Care, Premium | Florida | Health Plans |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Revenue | $ |  |  | 232 |
Health Care, Premium | Washington | Health Plans |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |
Revenue | $ |  |  | $ 1,083 |

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