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Commitments (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) | Mar. 24, 2016 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |  |
Rent expense | $ 207 | $ 171 | $ 137 |
2019 | 174 |  |  |
2020 | 176 |  |  |
2021 | 145 |  |  |
2022 | 101 |  |  |
2023 | 71 |  |  |
Thereafter | 200 |  |  |
Annual non-cancelable minimum lease payments, Total | $ 867 |  |  |
Long term investment, California Organized Investment Network |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | $ 30
Commitment to undertaking, term | 5 years |  |  |
Long term investment, service center in California |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | 200
Commitment to undertaking, term |  | 10 years |  |
Commitment to undertaking, expensed | $ 8 |  |  |
Long term investment, service center in California | Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking, by employing (people) (at least) | employee |  | 300 |  |
Long term investment, improve enrollee health outcomes |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | 10
Long term investment, support locally based consumer assistance programs |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | 5
Commitment to undertaking, term |  | 5 years |  |
Long term investment,improvement in enrollee health, locally based consumer assistance, and health care delivery system |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | 65
Long term investment,improvement in enrollee health, locally based consumer assistance, and health care delivery system | Selling, General and Administrative Expenses |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking, expensed | 13 |  |  |
Long term investment, strengthen the healthcare delivery system |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | 50
Commitment to undertaking, term |  | 5 years |  |
Long term investment, vehicles supporting California’s health care infrastructure |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitment to undertaking |  |  |  | $ 75
Commitment to undertaking, expensed | $ 12 |  |  |

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