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Segment Reporting - Reconciliation of Operating Earnings to Net Income (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) store | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) store | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 09, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income (GAAP measure) | $ 3,037,000,000 | $ 2,928,000,000 | $ 3,332,000,000 | $ 2,690,000,000 | $ 824,000,000 | $ 2,574,000,000 | $ (1,373,000,000) | $ 1,996,000,000 | $ 11,987,000,000 | $ 4,021,000,000 | $ 9,538,000,000 |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 2,436,000,000 | 1,006,000,000 | 817,000,000 |
Acquisition-related transaction and integration costs |  |  |  |  |  |  |  |  | 480,000,000 | 492,000,000 | 65,000,000 |
Charges in connection with store rationalization |  |  |  |  |  |  |  |  | 231,000,000 | 0 | 215,000,000 |
Loss on divestiture of subsidiary |  |  |  |  |  |  |  |  | (205,000,000) | (86,000,000) | (9,000,000) |
Goodwill impairments |  | 0 |  |  |  |  |  |  | 0 | 6,149,000,000 | 181,000,000 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 0 | 43,000,000 | 0 |
Interest income on financing for the Aetna Acquisition |  |  |  |  |  |  |  |  | 0 | (536,000,000) | 0 |
Adjusted operating income |  |  |  |  |  |  |  |  | $ 15,339,000,000 | 11,261,000,000 | 10,825,000,000 |
Retail/ LTC |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges in connection with store rationalization |  | $ 96,000,000 |  | $ 135,000,000 |  |  |  |  |  |  | 215,000,000 |
Goodwill impairments |  |  |  |  |  |  |  |  |  | 6,149,000,000 | $ 181,000,000 |
Number of under performing stores | store |  | 22 |  | 46 |  |  |  |  |  |  |  |
RX Crossroads |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on divestiture of subsidiary |  |  |  |  |  |  |  |  |  | $ 725,000,000 |  |
2018 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issued in acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000,000

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