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Goodwill and Other Intangibles - Goodwill and Disposal (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2018
Goodwill |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  | $ 0 |  | $ 181 |  |  |
Cumulative goodwill impairments |  | $ 181 |  |  | $ 181 |  |  |
Statutory income tax rate | 21.00% |  |  |  | 35.00% | 35.00% | 35.00% |
Income tax provision |  |  |  |  | $ 1,637 | $ 3,317 | $ 3,386 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Goodwill, beginning balance | $ 38,451 |  |  |  | 38,249 | 38,106 |  |
Acquisitions |  |  |  |  | 385 | 126 |  |
Foreign currency translation adjustments |  |  |  |  | (2) | 17 |  |
Impairment |  |  | $ 0 |  | (181) |  |  |
Goodwill, ending balance |  | 38,451 |  |  | 38,451 | 38,249 | 38,106 |
Pharmacy Services Segment |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Goodwill, beginning balance | 21,819 |  |  |  | 21,637 | 21,685 |  |
Acquisitions |  |  |  |  | 182 |  |  |
Other |  |  |  |  |  | (48) |  |
Goodwill, ending balance |  | 21,819 |  |  | 21,819 | 21,637 | 21,685 |
Retail/LTC Segment |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  | 181 |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Goodwill, beginning balance | $ 16,632 |  |  |  | 16,612 | 16,421 |  |
Acquisitions |  |  |  |  | 203 | 126 |  |
Foreign currency translation adjustments |  |  |  |  | (2) | 17 |  |
Impairment |  |  |  |  | (181) |  |  |
Other |  |  |  |  |  | 48 |  |
Goodwill, ending balance |  | 16,632 |  |  | 16,632 | $ 16,612 | $ 16,421 |
Rx Crossroads Member |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |
Goodwill, impairment loss |  | 46 |  | $ 135 |  |  |  |
Deferred tax liability decrease |  |  |  |  | 47 |  |  |
Income tax provision |  |  |  |  | $ 47 |  |  |
Adjustment to goodwill related to Tax Cuts and Jobs Act |  | 47 |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Impairment |  | $ (46) |  | $ (135) |  |  |  |
Disposal group |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | $ 725

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