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Goodwill and Other Intangibles - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 02, 2018
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative goodwill impairments |  | $ 6,100,000,000 |  |  |  |  | $ 6,100,000,000 | $ 6,100,000,000 |  |
Goodwill impairments | $ 0 |  |  |  |  |  | 0 | 6,149,000,000 | $ 181,000,000 |
Goodwill |  | 78,678,000,000 |  |  | $ 38,451,000,000 |  | 79,749,000,000 | 78,678,000,000 | 38,451,000,000 |
Amortization of intangible assets |  |  |  |  |  |  | 2,436,000,000 | 1,006,000,000 | 817,000,000 |
RX Crossroads |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  | 46,000,000 | $ 135,000,000 |  |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit |  |  |  |  |  |  |  |  | 47,000,000 |
Increase in carrying amount of reported unit |  |  |  |  |  |  |  |  | 47,000,000 |
Retail/ LTC |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  |  |  |  |  |  |  | 6,149,000,000 | 181,000,000 |
Goodwill |  | 10,806,000,000 |  |  | $ 16,632,000,000 |  | 10,807,000,000 | $ 10,806,000,000 | $ 16,632,000,000 |
Retail/ LTC | Long-Term Care Reporting Unit |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairments |  | $ 2,200,000,000 | $ 0 | $ 3,900,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 431,000,000 |  |  |
Discontinued Operations, Disposed of by Sale | RX Crossroads | Retail/ LTC |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal consideration received |  |  |  |  |  |  |  |  |  | $ 725,000,000

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